Diy Chevrolet Cruze caliper repair

Replacement pads Chevrolet Cruze with your own hands will save you on a trip to a car service. Today we will tell you in detail how to change the front and rear pads of a Chevrolet Cruze. On all 4 wheels there is a disc mechanism with a caliper and a floating bracket that moves thanks to guide pins. There are ventilated discs in the front, ordinary discs in the back. To work, you will need a set of standard tools, a jack and a reliable stand.

If the fluid level in the reservoir of the brake and clutch hydraulic drive is at the MAX mark, then before installing the new pads with a syringe or rubber bulb, we pump out a part of the fluid from the reservoir so that when the piston is pushed into the working cylinder of the brake mechanism, the fluid does not leak out from under the reservoir cap.

Remove the front wheel and place the vehicle on a factory-made stand. We turn the steering wheel all the way in the direction on which we replace the brake pads. Insert a wide-blade screwdriver through the caliper window between the inner brake pad and the piston end. Leaning on the block with a screwdriver, we sink the piston into the cylinder and slide the caliper along the guide pins.

Using a 10 spanner wrench, unscrew the bolt securing the caliper to the lower guide pin, holding the guide pin with the 18 key. Prying the lower part of the caliper, turn the caliper on the upper guide pin relative to the guide pads.

We take out the outer and inner pads from the brake pad guide. We take out the upper and lower pressure plates from the shoe guide.

We take out the lower guide pin from the hole in the guide pads. If the rubber protective boot of the guide pin is torn or has lost its elasticity, it must be replaced. Remove the rubber protective cover from the finger and install a new cover.

If necessary, in the same way (by unscrewing the bolt securing the caliper to the upper guide pin and moving the caliper away from the guide pads), replace the cover of the upper guide pin of the Chevrolet Cruze brake mechanism.

We clean the parts of the brake mechanism from dirt and corrosion, especially the pressure plates of the pads and their seats in the guide of the pads. It is forbidden to use gasoline and diesel fuel to clean the brakes.

Before installing new brake pads, it is necessary to move the piston into the cylinder as much as possible. To do this, carefully, so as not to damage the boot of the piston and the plastic piston itself, we recessed the piston into the cylinder with sliding pliers.

We assemble the Cruz brake mechanism in reverse order. When installing a Chevrolet Cruze inner pad, orient it so that the acoustic wear indicator is at the top of the pad. Tighten the bolts of the caliper to the guide pins with a torque of 28 Nm.

After replacing the pads in the brake mechanisms of both front wheels, we press the brake pedal several times to set the gaps between the pads and discs. Then, be sure to check the level of the working fluid in the brake and clutch hydraulic reservoir and, if necessary, bring it to normal. After all, initially we removed some of the liquid, so it is worth adding it.

Remove the rear wheel and place the Chevrolet Cruze on a sturdy stand. Using the key "13", rotate the anti-vibration weight of the brake mechanism counterclockwise by the hexagon, holding the lower guide pin of the caliper with the key "18".

We remove the anti-vibration weight.Using a spanner wrench "10", unscrew the bolt fastening the caliper to the upper guide pin, holding the finger by the hexagon with a wrench "18".

We remove the caliper from the guide pads without disconnecting the brake hose and the parking brake cable from it. We place the caliper on the spacer for attaching the shoe guide.

Using the blade of a screwdriver, we "sink" the retainer on the lower pressure plate of the pads. We take out the outer brake shoe from the shoe guide. Likewise, remove the inner brake shoe from the shoe guide.

Before installing new shoes, remove the upper and lower pressure plates from the shoe guide. We clean the parts of the brake mechanism from dirt and corrosion, especially the pressure plates of the brake pads and their seats in the guide of the pads. It is forbidden to use gasoline and diesel fuel to clean the brakes. Having inserted the pressure plates into the shoe guide, we install new brake pads. When installing the inner pad, orient it so that the acoustic wear indicator is at the top of the pad. Before installing the Chevrolet Cruze caliper, it is necessary to move the piston into the cylinder as much as possible.

To do this, insert the pliers with narrow jaws into the piston sockets and turn it clockwise while pressing the piston. Our task is to screw the piston into the cylinder as deep as possible so that there is no problem with the installation of new Chevrolet Cruze pads, which are much thicker than worn ones.

We inspect the boot of the piston; if the boot is damaged, we replace it. Before installing the caliper, you must also check the condition of the guide pins and their protective covers. We take out the upper guide pin of the caliper from the hole of the guide pads.

Remove the rubber corrugated cover from the finger. Similarly, we take out the lower guide pin (with a plastic anti-squeak bushing on the pin rod) from the hole in the guide pads and remove the rubber corrugated cover from it.

We inspect the rubber covers of the guide pins and if the covers are damaged - cracks, tears, loss of elasticity of the rubber - we replace them with new ones. Having installed new protective covers for fingers, we apply a layer of plastic heat-resistant grease to the rods of the fingers. We insert our fingers into the holes of the guide blocks and install the caliper. The caliper mounting bolt and anti-vibration weight are tightened to a torque of 28 Nm.

Similarly, we replace the brake pads of the brake mechanism of the right rear wheel. After replacing the pads, we press the brake pedal several times to set the gaps between the pads and discs. We check the level of the working fluid in the brake and clutch hydraulic reservoir and, if necessary, bring it to normal. Naturally, we change the entire set of pads 4 pieces at once. And after assembling the mechanism, be sure to check the operation of the hand brake.

My car is relatively new, I shouldn't have any complaints about it. Moreover, on my Chevrolet Cruze, I change everything in a timely manner, undergo maintenance. But I still have complaints and they relate to the brake calipers. Moreover, both rear and front calipers knock.

The front ones knock harder, but this is due to the wear of the pads. Let me remind you that the car is relatively new, its mileage is only 29 thousand kilometers. The first time I heard a knock was when the pads were half worn out. How exactly to recognize this knock, how does it manifest itself? He starts knocking when driving on uneven roads, when the speed is above 40 kilometers per hour. If you are not sure if these are calipers, then get behind the wheel and try pressing the brake pedal.

If you hear a clang, then you can be sure that the problem is in the calipers. I must say that this is the model's illness, and not only her.It is worth entering the phrase on the Internet, as we will get a large number of links to the owners of Chevrolet, Nissan, Toyota, etc. We remove the front wheel and swing the caliper across the body. There is a backlash somewhere in the region of one and a half millimeters and the same knock.

Okay, you've identified the problem, now it's time to fix it. There are few options here. If the car is still under warranty, then we go to an authorized dealer and start demanding the replacement of the mechanism, but then a knock will still appear later. You can disassemble the brake mechanism and lubricate the guides, the knocking will disappear, for about a month. You can carve new guides and the knock will disappear, but there is no guarantee that it will not reappear. Another option - after the groove, we install rubber rings, only they need to be chosen correctly.

I took an easier, but very reliable way, which will solve my problem once and for all. In general, it is necessary to install spacer springs and then the backlash, like the knock, will disappear. After the repair, I drove a week, but how can I be sure that there will be no more knocking. And thanks to the spring, a tension is formed, which simply will not allow anything to knock here.

This knock overpowered me (both the rear and the front knock, the front knock harder due to the greater wear of the pads), the mileage is 26t.km. The knock manifested itself at 50% wear on the front pads. How does this knock appear and how do you recognize it? It knocks on small irregularities, joints, on gravel - at a speed of about 40 km. It is checked by pressing the brake pedal, if the knocking, "rumbling", "booming" has disappeared, then the caliper!
In general, this is a common disease, enter the phrase support knocks in any search engine and we will get a bunch of links. Knocks on Toyota, Nisan and other foreign cars….

You can check and make sure that it is the calipers that are knocking by removing the front wheel and shaking the caliper across the car… the backlash is 1-1.5 mm. and emits the same knock in motion over unevenness.

Options for resolving the issue.
1.Guarantee auto-remove the brain "Oofitsialam" and achieve replacement mechanisms. (knocking will appear again later)
2. Disassemble the mechanism, lubricate the guides. (knocking will appear after 1 month. again)
3.Dismantle the mechanism, order to grind new guides from + to 0.3 (not the fact that it will not knock again)
4.Dismantle the mechanism, make grooves on the guides and install rubber rings (you will need to select oil-resistant rubber bands, there is a possibility of jamming the guides in case of an error)
5. Install the spacer springs.
As I did ... the rear caliper (spring from the clamshell)

For owners of the Chevrolet Cruze car, we recommend downloading the Chevrolet Cruze repair and maintenance manual

Many owners of a Chevrolet Cruze after 20 thousand kilometers of driving are faced with serious problems that are associated with malfunctioning brake calipers. In most cases, a knock appears, which indicates various malfunctions. For example, brake pad wear is assumed, which can be as high as 50 percent. Moreover, when driving at low speed on small irregularities in the road, knocking appears if the reason lies in the calipers. However, in order to finally be convinced of the reason, it is recommended to remove the front wheel and check the brake caliper across. If the movement is between one and one and a half millimeters, the cause of the problem will be confirmed.

Many motorists are interested in how you can successfully and quickly eliminate the knock of Chevrolet Cruze calipers. There are various ways to do this:

1. Dismantling the caliper with further lubrication of all guides. However, after completing such an event, the problem can be solved for about a month.
2. Manufacturing of thickened brake caliper guides. It should be understood that even after performing such a procedure, there is a risk that the problem will reoccur in the future.
3. Creation of groove guides that will be oriented under the rubber wheels.In this case, it is necessary to select oil-resistant rings made of high-quality rubber. It must be understood that a violation of the procedure technology will lead to the fact that the guides will jam.
4. If necessary, you can order a set of guides, for one of which a rubber cuff will be offered. However, such a package will have a rather high cost. It should be noted that one set has only one guide with an elastic band, but four such products are required for the successful operation of the mechanism. The approximate price of one set is 1300 rubles.

Thus, in order to successfully solve the problem, which is associated with the technical nuances of the Chevrolet Cruze and hassle-free travel, you will need to take a responsible approach. Many Chevrolet Cruze drivers confirm that technical knocks are noticeable after about twenty thousand kilometers. However, to understand the reason for such sounds is not always as easy as we would like it to be. How to understand the state of the Chevrolet Cruze caliper:

1. Initially, it is recommended that you carefully inspect the brake pads and look for wear. If the pads are worn by about half, you can be sure that the knock comes from the calipers.
2. When driving at low speed on holes and other irregularities in the road, it is advisable to press the brake pedal. If the sound passes, you can be sure that the caliper makes an unpleasant knock.
3. However, one still needs to get rid of the last doubts. To do this, it is recommended to remove the front wheel of the car and swing the caliper across the position. The backlash should be less than 1–1.5 millimeters. Otherwise, doubts will be confirmed.

Experts note that it is advisable to repair the rear caliper of the Chevrolet Cruze only after it was finally possible to make sure of the reasons for the malfunction of the technical equipment of the car. Many experienced drivers recommend installing spacer springs, which are cheaper than rail guides, but guarantee a long lasting effect.

Repairing the front and rear calipers is different, so it is advisable to take into account the main nuances of the upcoming events. This largely determines how successful the repair measures will be and whether it will be possible to improve the technical characteristics of the car.

It should be noted that for the high-quality functioning of the Chevrolet Cruze, it will be necessary to regularly change the used technical fluid (it is advisable to replace it at least once every 2 years). Correct maintenance ensures that the front caliper remains operational and the technical system remains reliable.

It is advisable to carry out repair activities only by professionals. The upcoming repair measures imply the obligatory consideration of numerous nuances, the consistent implementation of the assigned tasks, the use of high-quality components. Only with the correct repair can you expect that the Chevrolet Cruze front caliper will still work correctly.

In this case, a professional repair is also recommended, since a preliminary diagnosis is carried out to accurately determine the cause of the malfunction. You need to understand that the same signs may indicate problems with the front and rear caliper. Only experts can understand what the real reason is.

In order to successfully repair the rear brake caliper of the Chevrolet Cruze, it is recommended to follow the entire sequence of planned measures and act in accordance with the manufacturer's regulations. It is recommended to use special tools, original accessories for a successful rear caliper repair.

Experts note that repair measures can be extremely difficult if the parts are badly worn or deformed. In this case, instead of repair, it becomes possible only to replace the caliper, since otherwise, after the repair measures, the braking system, after a few hundred kilometers, will again begin to give serious malfunctions.

Disc brakes and front and rear calipers are easy to maintain. However, the following important aspects need to be taken into account:

• monitoring the pressure in the brake system is mandatory, and for this you need to monitor the condition of the brake cylinder and fluid;
• there must be only a certain level of brake fluid in the cylinder;
• Damage to the boot of the braking system is not allowed, and dust or dirt on the mechanism can lead to unwanted damage.

The above problems can be successfully eliminated only with an understanding of the scheme according to which the components of the technical system will work.

Replacing and repairing a Chevrolet Cruze caliper may be delayed if proper machine maintenance is carried out.

Many Chevrolet Cruze owners after the first 20,000 km. operating a new car are faced with the problem of knocking brake calipers. It is very easy to determine the source of the knock. First, pay attention to the brake pad wear, if it is 50%, that is, there is every reason to assume that the calipers are knocking. Secondly, when driving at low speed on small irregularities, press the brake pedal, if the knocking disappears, then the reason is in the calipers. And in order to finally be convinced of the source of the “rumble”, remove the front wheel and swing the brake caliper across, if the backlash is 1-1.5 mm, therefore, the reason lies precisely here.

How to eliminate the knock of Chevrolet Cruze calipers

There are several options to get rid of the clatter of Chevrolet Cruze brake calipers:

• Disassembling the caliper and lubricating the guides solves the problem for about a month
• The manufacture of new thickened (+0.3) brake caliper guides, as in the first case, does not guarantee the occurrence of this problem in the future.
• Make grooves for the guides for the rubber rings. In this case, a selection of oil-resistant rubber rings will be required. In this case, there is a high probability of jamming of the guides if this modification is performed incorrectly.

Order a set of guides, one of which has a rubber sleeve. It is worthwhile, but expensive. One set has only one guide with an elastic band; four of them come out. The approximate cost of one is 1300 rubles

This is a specialized sub-forum. Flood is strictly prohibited!

Group: Active users
Posts: 90
Registration: 5.10.2012
From: Donetsk

My car: Chevrolet Lacetti SE 1.6 2005

Guys, tell me where in Donetsk to make an audit, (sort through, clean) the rear brake calipers?
And then the discs are very hot, etc.

Post has been edited aal – 31.5.2013, 20:19

Group: Active users
Posts: 90
Registration: 5.10.2012
From: Donetsk

My car: Chevrolet Lacetti SE 1.6 2005

Youngsters mentor

Group: Global Moderators
Posts: 2 501
Registration: 20.11.2006
From: Kiev, Lesnoy
Real name: Victor
Club card number 373

Group: Active users
Posts: 535
Registration: 2.2.2013
From: Hohlyadiya or what's left of her

My car: Lacetti 1.8 CDX

Group: Beginners
Posts: 17
Registration: 20.10.2012
From: Kiev, Otradny
Real name: Sergey

My car: Lacetti Wagon, 2005, 144k.

Group: Active users
Posts: 4,573
Registration: 12/27/2009
From: Kiev Borshaga.
Real name: Sergei

My car: 1.6 165 thousand km and GeBeOmatiego

Group: Beginners
Posts: 17
Registration: 20.10.2012
From: Kiev, Otradny
Real name: Sergey

My car: Lacetti Wagon, 2005, 144k.

Group: Active users
Posts: 1,440
Registration: 24.3.2010
From: Kiev
Real name: Yuri

My car: Lacetti 1.8 wagon CDX

It turned out that the pads did not move freely (rear calipers). The piston pressed the pads against the disc, he moved away and there is no pads or a little bit. It seems that it does not rub when driving, but it gets warm. Clean the pads well. The pads move along a stainless plate, clean it from rust underneath and above it. The photo shows that the pads are very close to the disc. Cleaned off the rust and everything is OK.

Post has been edited Ura1961 – 31.7.2013, 6:55

Group: Active users
Posts: 183
Registration: 12/25/2012
From: Cherkasy region.
Real name: Ilya

My car: Chevrolet lacetti 1.6 sedan

As I understand it, they just removed the caliper without disassembly. (just pressing a pry bar is not a solution to the problem)
I pulled out the piston with such a problem, changed the anthers and soaked it in Coca-Cola (do not laugh) thoroughly cleaned the rust in the seats of the cuff and the anther of the piston. result - I move the piston with my finger.
Yes, I almost forgot, I changed the rubber bands (cuff, piston boot), I bought a repair kit for 30 hryvnias on the existential it seems.

In total, 5 tyk is normal to fly, although the first support was changed on the advice of the "master" at the service station, I will say this - I threw 1300 into the wind.
I did not encounter guides, but the problem with the piston is solved easily and painlessly.

Post has been edited IL-86 – 30.7.2013, 21:14

Replacing the master brake cylinder Chevrolet Cruze

Disconnect the wire from the negative terminal of the storage battery.

Unscrew the cap of the brake master cylinder reservoir and pump out the brake fluid from the reservoir, for example with a large medical syringe.

Rice. 30. The main brake cylinder (GTZ)

1 - piston pusher; 2 - cylinder mounting flange; 3.4 - connecting sleeves; 5 - the body of the brake cylinder; 6, 7 - connecting holes of pipelines; 8 - hole for the tank mounting bolt; 9 - rubber sealing ring

Unscrew the nuts securing the brake pipelines to the GTZ and take the pipelines to the side.

Unscrew the two flange nuts 2 (see Fig. 30) securing the main brake to the vacuum brake booster and remove the main brake cylinder.

If during operation there was a leakage of brake fluid through the connecting sleeves, remove the sleeves from the holes in the body.

Remove the rubber O-ring from the brake master cylinder body.

Install the GTZ and all removed parts in the reverse order of removal.

Replacing the brake hoses

Replace hoses and lines if damaged. In addition, we recommend, for preventive purposes, to replace the hoses every 150 thousand kilometers or 5 years of vehicle operation (whichever comes first), even if they are not externally damaged.

On the Chevrolet Cruze, four brake hoses are used - two (rear) - to connect the pipelines to the working cylinders of the rear brake mechanisms and two (front) - to connect the pipelines to the working cylinders of the front brake mechanisms.

Remove the intermediate hose end attached to the shock absorber bracket.

Unscrew the nut securing the brake pipe to the front brake hose and disconnect the hose.

To prevent complete leakage of fluid from the hydraulic actuator, immediately plug the pipeline opening in any way possible. The protective caps of the air vent valves are very suitable for this purpose.

Unscrew the bolt-fitting securing the lower tip of the hose to the brake slave cylinder of the front wheel and remove the hose.

Note the two copper sealing washers located on either side of the hose end. Replace these washers with new ones when reassembling.

Install the new hose in the reverse order of removal.

Brakes front wheels Chevrolet Cruze

Replace the front brake pads only in a set of 4 (two on each side). Before replacing brake pads, check the brake fluid level in the brake master cylinder reservoir.

If the level is close to the “MAX” mark, it is necessary to pump out some of the liquid (for example, with a medical syringe or a rubber bulb), because after replacing worn-out pads with new ones, the level will rise.

Remove the caliper lower guide pin retaining bolt. Lift the caliper up.

Remove the Chevrolet Cruze inner and outer brake pads.

Remove the lower and upper retaining springs from the shoe guide.

In order to reduce the vibration of the brake pads when the wheels rotate, retaining plates are installed in the grooves of the shoe guide. When replacing the pads, replace them with new ones.

Sink the piston into the slave cylinder using pliers.

Every time you replace the brake pads, it is imperative to check the condition of the protective rubber covers of the guide pin, as well as the movement of the caliper relative to the guide pads.

If movement is difficult, lubricate the caliper guide pins with grease. To do this, remove the guide pin, lubricate it with grease, and then lubricate the finger guard with grease. Lubricate the second guide pin and its cover in the same way.

Install the guide pins in the reverse order of removal.

Install the retaining springs, brake pads in the rails and other parts in the reverse order of removal. To prevent self-loosening of the caliper guide pin fastening bolt, lubricate its thread before installing with an anaerobic thread lock.

Replace the brake pads of the brake mechanism of the left front wheel in the same way.

Check and, if necessary, restore the brake fluid level in the reservoir of the master brake cylinder.

Replacing the front brake caliper

Remove the front wheel from the side of the caliper being replaced.

Remove the bolt union and disconnect the brake hose from the caliper.

Remove the bolts securing the guide pads to the steering knuckle Chevrolet Cruze

Install the caliper in the reverse order of removal.

Apply an anaerobic thread lock to the threads before installing the shoe guide bolts to the steering knuckle. When installing the brake hose, use only new copper washers.

After installation, restore the level of the brake fluid in the reservoir of the master brake cylinder and bleed the air from the hydraulic brake actuator.

Replacing the front wheel brake disc

If there are scoring, deep scratches and other defects on the working surface of the disc that increase the wear of the pads and reduce the braking efficiency, as well as in the case of increased lateral runout of the disc, which causes vibration during braking, replace the brake disc.

In specialized workshops, such a disc can be ground and grinded on both sides to the same depth, but after processing, the thickness of the disc must not be less than the minimum permissible.

The minimum thickness of the front wheel mechanism brake disc is 24 mm. If one of the discs is less than the specified thickness, replace both discs. When replacing brake discs, be sure to replace the brake pads with a new set.

Remove the wheel from the side of the disc to be replaced.

Remove the bolts securing the guide pads to the steering knuckle.

Remove the caliper assembly without disconnecting the brake hose, and secure with wire, not allowing the hose to be twisted or pulled

Remove the screw securing the disc to the hub and remove the disc.

Before installing the brake disc, thoroughly clean the mating surfaces of the hub and disc from rust and scale, since even the smallest particle trapped between the mating surfaces will cause the disc to run out and vibrate during braking.

Press down on the brake pedal several times. This is necessary in order to select the clearances in the brake mechanism that appeared after the pistons were pressed into the cylinders.

Parking brake adjustment for Chevrolet Cruze

The Chevrolet Cruze uses a parking brake cable system with an automatic tensioning system. If necessary, the tension of the parking brake cables can be loosened and restored, for example, for servicing disc brakes or the parking brake system.

Raise and fully lower the parking brake lever several times.

Make sure the parking brake lever is fully depressed.

Switch on the ignition. Check that the brake system malfunction lamp is off.

If the brake system warning light is on, check that the parking (hand) brake lever is fully lowered at the stop and that there is no slack in the parking brake cables.

With the parking (hand) brake lever fully depressed, check the parking brake levers on the rear calipers. The levers must be on the stops in the caliper housings. If the levers are not in the stops, seizure may occur.

Raise and lower the parking brake lever 3-5 times so that the cable tensioner absorbs the slack in the parking brake cables.

Raise the parking brake lever all the way.

Try to turn the rear wheels - the wheels should be braked.

Fully lower the hand brake lever.

Make sure the parking brake is released while turning the wheels. The wheels should rotate freely, without braking.

Lower the vehicle from a lift or jack.

Removal and installation of the hand brake lever

Disconnect the wire from the negative terminal of the storage battery.

Lift up the back of the floor tunnel lining.

Disconnect the end of the Chevrolet Cruze parking brake cable from the equalizer.

Remove the mounting bolt and remove the parking brake warning light switch.

Release the catches and disconnect the harness from the handbrake warning light switch.

Unscrew the four nuts securing the parking brake lever and remove the lever

Before installing on the vehicle, lubricate the gear section of the lever with grease.

Install the parking brake lever and all removed parts in the reverse order of removal.

The Chevrolet Cruze car is equipped with two independent braking systems: working and parking. The first, equipped with a hydraulic drive, provides braking when the car is moving, the second brakes the car in the parking lot.

The working braking system of the Chevrolet Cruze is double-circuit, with a diagonal connection of the brakes of the front and rear wheels. One circuit of the hydraulic drive provides the operation of the right front and left rear brakes, the other - the left front and right rear.

Rice. 26. Brake system Chevrolet Cruze

1 - brake disc of the right front wheel; 2 - brake mechanism of the right front wheel; 3 - flexible hose of the brake mechanism of the right front wheel; 4 - pipeline of the brake mechanism of the right front wheel; 5 - vacuum amplifier; 6 - parking brake drive lever; 7.16 - parking brake drive cables; 8 - brake disc of the right rear wheel; 9 - brake mechanism of the right rear wheel; 10 - flexible hose of the brake mechanism of the right rear wheel; 11 - pipeline of the brake mechanism of the right rear wheel; 12 - pipeline of the brake mechanism of the Chevrolet Cruze of the left rear wheel; 13 - flexible hose of the brake mechanism of the left rear wheel; 14 - brake mechanism of the left rear wheel; 15 - brake disc of the left rear wheel; 17 - brake pedal; 18 - brake mechanism of the left front wheel; 19 - brake disc of the brake mechanismleft front wheel; 20 - flexible hose of the brake mechanism of the left front wheel; 21 - pipeline of the brake mechanism of the left front wheel; 22 - ABS hydroelectronic module; 23 - the main brake cylinder

If one of the circuits of the service braking system fails, another circuit is used to stop the vehicle with sufficient efficiency.

The hydraulic drive of the Chevrolet Cruze includes a master brake cylinder 23 (Fig. 26), a vacuum booster 5, a hydroelectronic module 22 of an anti-lock braking system, brakes of the front and rear wheels together with working cylinders, pipelines.

Parking brake system Chevrolet Cruze with a cable drive on the brakes of the rear wheels.

Rice. 27. Brake mechanism front wheel Chevrolet Cruze

1 - brake disc; 2 - shoe guide; 3.8 - protective covers for the guide pins; 4.7-bolts for fastening the caliper guide pins; 5-brake hose; 6-valve for air release; 9 - boot of the brake cylinder piston; 10 - brake shoe; 11 - brake caliper

The brake mechanism of the front wheel of the Chevrolet Cruze is disc, with automatic adjustment of the gap between the pads 10 (Fig. 27) and the disc 1, with floating
staple.

The movable bracket is formed by a caliper 11 with a single-piston working cylinder. The shoe guide is bolted to the steering knuckle.

The Chevrolet Cruze caliper is attached with bolts 4 and 7 to guide pins installed in the holes of the guide pads. The guide pins are greased and protected by rubber boots.

A piston with an O-ring is installed in the cavity of the wheel cylinder of the Chevrolet Cruze. The elasticity of this ring maintains an optimal clearance between the pads and the ventilated disc, the surface of which is protected by a brake shield.

When braking, the piston, under the influence of fluid pressure, presses the inner pad against the disc of the Chevrolet Cruze, as a result of the reaction force, the caliper moves on the fingers and the outer pad is also pressed against the disc, while the pressing force of the pads is the same.

When releasing the piston, due to the elasticity of the sealing ring, it is removed from the pad, a small gap forms between the pads and the disc.

The main brake cylinder of the Chevrolet Cruze (Fig, 28) is a tandem hydraulic brake drive consists of two separate chambers connected to independent hydraulic circuits. The first camera is associated with the right front and left rear brakes, the second with the left front and right rear.

Rice. 28. The main brake cylinder Chevrolet Cruze with a reservoir

1 - brake fluid level sensor; 2 - reservoir of the main brake cylinder; 3.10 - lugs of the cylinder mounting flange; 4 - the body of the brake cylinder; 5 - piston pusher; 6 - cork stopper; 7, 8 - connecting holes of pipelines; 9 - sealing ring

Tank 2 is installed on the main brake cylinder of the Chevrolet Cruze through rubber connecting bushings, the inner cavity of which is divided by partitions into three compartments. Each compartment feeds one of the brake master cylinder chambers and the clutch master cylinder.

When you press the brake pedal, the pistons of the master brake cylinder of the Chevrolet Cruze begin to move, the working edges of the cuffs overlap the compensation holes, the chambers and the reservoir are disconnected and the brake fluid is displaced.

A brake fluid level sensor 1 is installed in the reservoir housing. When the liquid level falls below the permissible level in the instrument cluster, the warning lamp for the malfunctioning state of the brake system lights up.

The Chevrolet Cruze vacuum booster, installed between the pedal mechanism and the main brake cylinder, when braking due to vacuum in the intake pipe of the engine through the rod and the piston of the first chamber of the main cylinder, creates an additional force proportional to the force from the pedal.

A check valve is installed in the hose connecting the Chevrolet Cruze vacuum booster to the intake pipe. It holds the vacuum in the amplifier as it falls in the intake manifold.

The vacuum brake booster is the most common type of brake booster used in the braking system of a modern car. It generates additional force on the brake pedal through vacuum.

The use of an amplifier greatly facilitates the work of the braking system of a Chevrolet Cruze car and thereby reduces driver fatigue. Structurally, the vacuum booster forms a single unit with the brake master cylinder.

Rice. 29. Brake mechanism of the rear wheel of the Chevrolet Cruze

1 - parking brake drive cable; 2 - return spring of the parking brake mechanism; 3 - air release valve; 4 - brake hose; 5.12 - guide pins of the support; 6- shoe guide; 7 - brake disc; 8- brake caliper; 9.10 - brake pads; 11 - anther of the working cylinder piston; 13 - brake shield; 14 - working cylinder; 15 - parking brake drive lever; 16 - the tip of the drive cable

The brake mechanism of the rear wheel of the Chevrolet Cruze is disc, with automatic adjustment of the gap.

Brake pads 9 and 10 (fig. 29) are driven by one hydraulic slave cylinder. The optimal clearance between the disc and the pads is maintained according to the same principle as for the brakes of the front wheels.

The disc working brake mechanism of the rear wheel of the Chevrolet Cruze is combined with the parking brake mechanism. The inner cavity of the brake disc also serves as the brake disc of the parking brake.

The parking brake of the Chevrolet Cruze, mechanically actuated, consists of a lever, an adjusting device, two rear
cables and brakes on the rear wheels.

The anti-lock braking system (ABS) of the Chevrolet Cruze consists of wheel speed sensors, a brake pedal switch, a hydroelectronic control unit (HECU) and a warning light in the instrument cluster.

The anti-lock braking system is also equipped with a self-diagnosis system that detects malfunctions of system components.

ABS Chevrolet Cruze serves to regulate the pressure in the braking mechanisms of all wheels when braking in difficult road conditions, preventing the wheels from locking.

The ABS system of the Chevrolet Cruze provides the following benefits:

- obstacle avoidance with a higher degree of safety, including during emergency braking.

- reduction of the braking distance during emergency braking while maintaining directional stability and controllability of the vehicle - including in a corner.

In the event of a malfunction in the ABS system, the Chevrolet Cruze provides diagnostic and maintenance functions for system failures.

The hydroelectronic control module receives information about the vehicle speed, direction of travel and road conditions from the wheel speed sensors, the steering wheel angle sensor, and the throttle position sensor.

After turning on the ignition, the Chevrolet Cruze control unit supplies voltage to the wheel speed sensors. The sensors use the Hall effect, they generate an output signal in the form of rectangular pulses.

The signal changes in proportion to the rotational speed of the impulse ring of the sensor mounted on the outer hinge of the wheel drive. Based on this information, the control unit determines the optimum wheel braking behavior.

There are the following operating modes of the Chevrolet Cruze anti-lock braking system:

- normal braking mode. During normal braking, the solenoid valve is de-energized, the inlet valve is open, and the outlet valve is closed.

When the brake pedal is depressed, the brake fluid is supplied under pressure to the slave cylinder through the solenoid valve and activates the wheel brakes.When the brake pedal is released, the brake fluid returns to the brake master cylinder through the inlet and check valves.

- emergency braking mode. If, during emergency braking, the wheel begins to lock, the module issues a command to the solenoid valve to reduce the supply of brake fluid, then voltage is applied to each solenoid valve.

The inlet valve closes and the brake fluid supply from the master cylinder is shut off; the outlet valve opens, and the brake fluid flows from the working cylinder to the main cylinder, and then to the reservoir, which causes a decrease in pressure;

- pressure maintenance mode. With the maximum decrease in pressure in the working cylinder, the module issues a command to the solenoid valve to maintain the brake fluid pressure, voltage is supplied to the inlet valve and is not supplied to the outlet valve.

In this case, the inlet and outlet valves are closed and the brake fluid does not leave the working cylinder;

- pressure increase mode. If the module detects that the wheel is unlocked, then it de-energizes the solenoid valve.

The voltage is not applied to the solenoid valves, the brake fluid through the inlet valve enters the working cylinder, the pressure in which increases. For
diagnostics and repair of anti-lock braking system requires special equipment and accessories.

The hydraulic brake system of the Chevrolet Cruze is integrated into a single unit with metal pipes and flexible hoses. The system is filled with a special brake fluid of at least DOT-4 class, which must be replaced periodically.

If the brake pedal always vibrates when braking, the brake discs are most likely warped. Unfortunately, in such a situation, they only need to be changed, and both at once.

The periodically appearing and disappearing vibration of the pedal during sudden braking accompanies the operation of the anti-lock braking system and does not
is a symptom of a malfunction.

If, when braking, the machine begins to pull to the side, check the working cylinders: they may need to be replaced. If a knock appears in the front suspension that disappears during braking, check the tightening of the caliper mounting bolts.