homeQuicklyDo-it-yourself Ford transit brake repair
Do-it-yourself Ford transit brake repair
In detail: do-it-yourself Ford transit brake repair from a real master for the site my.housecope.com.
Ford Transit vehicles are equipped with a dual-circuit hydraulic braking system with diagonal or transverse division of the circuits (depending on the model - fig. 122). Disc brakes are installed on the front wheels, and drum brakes on the rear.
Brakes Ford Transit are actuated by the brake pedal, which is connected to the brake master cylinder and servo amplifier mounted on the bulkhead of the engine compartment.
Fig. 122. Braking system Ford Transit with diagonal division of the circuits and two pressure limiting valves in the rear brakes
In the case of transverse separation of the circuits, the primary section of the Ford Transit master cylinder serves the rear brakes, and the secondary section serves the front brakes.
In a diagonal split, the primary section of the master cylinder serves the left rear and right front brakes, and the secondary section serves the right rear and left front.
The primary section of the master cylinder is located at the rear (on the side of the servo amplifier).
Thanks to the use of a dual-circuit system, the Ford Transit brakes continue to work in the event of a failure (for example, when the brake hose breaks) of one of the circuits, although the braking efficiency is noticeably reduced.
The failure of one of the circuits does not affect the operation of the servo amplifier.
Fig. 123. Brake system Ford Transit with lateral division of the circuits and the brake force regulator in the rear circuit
Ford Transit models with independent front suspension have two-cylinder floating front brake calipers.
Rigid front axle models have fixed-body calipers with two or four (depending on model) pistons positioned in pairs opposite each other.
Video (click to play).
Rear drum brakes Ford Transit have one slave cylinder that drives both (active and passive) brake pads.
When you press the brake pedal, fluid pressure spreads the cylinder pistons in different directions, and the pistons press the brake pads against the drum.
Rear brakes Ford Transit have an automatic adjuster, which each time you press the brake pedal adjusts the position of the brake pads, depending on the degree of wear of the friction linings.
The friction pads are attached to the pads with special glue. The lining of the active pad of the rear brake is approximately twice as thick as the pad of the passive pad, which ensures approximately the same service life (the active pad wears out approximately twice as fast during operation).
The mechanical (cable) operated Ford Transit handbrake acts on the rear brake pads.
The handbrake lever is connected to the rear brakes by means of rods, an intermediate lever, a cable and handbrake drive levers on the pads. The pull of the handbrake lever can be adjusted, but in practice this is usually not required.
The Ford Transit vacuum servo amplifier, installed between the master cylinder and the bulkhead of the engine compartment, serves to increase the force transmitted from the brake pedal to the pistons of the master cylinder.
The servo amplifier works by the difference between atmospheric pressure and reduced pressure in the vacuum system.
If the servo fails, the brakes will continue to operate, but effective braking will require significantly more pressure on the brake pedal.
On Ford Transit diesel engines, the vacuum in the intake manifold is low, so a special vacuum pump is used to ensure the operation of the servo amplifier, which is mounted on the rear of the generator and is driven directly from the generator shaft.
The hydraulic system of the rear brakes of the Ford Transit includes a pressure limiting valve or a brake force regulator (depending on the model).
The function of these devices is to reduce the brake fluid pressure in the rear brakes in order to prevent premature locking of the rear wheels.
Maintenance of the brake system Ford Transit
General check of the brake system Ford Transit
While your Ford Transit is in motion, check the brakes periodically to diagnose faults in a timely manner.
From time to time, check the operation of the servo amplifier, for which, with the engine not running, press the brake pedal several times to use up the vacuum in the servo amplifier, and then press the brake pedal and start the engine while keeping the pedal depressed.
When starting the engine, the pedal should move slightly downward. After that, turn off the engine, then press the pedal several times - during the first 4 - 5 pedal movements, you should hear a hiss of air in the servo amplifier, then it will disappear, and the pedal will become "harder".
Test your sensations as you press the pedal. If the pedal is "soft", that is, the resistance gradually increases as the pedal moves down, then this indicates the presence of air in the system, or an internal rupture of the brake hose (in this case, when the pedal is depressed, a characteristic swelling is noticeable on the hose).
If the pedal "falls through" (slowly or quickly moves to the floor at constant pressure), then there is a fluid leak in the Ford Transit brake system or the brake master cylinder is faulty (cuffs bypass fluid inside the cylinder).
If the pedal is "inflated", that is, it meets normal resistance only at the second or third press, then this indicates excessive wear of the pads or incorrect adjustment of the wheel brakes (malfunction of the automatic regulator of the rear brakes).
Checking the level, changing the brake fluid and bleeding the brake system Ford Transit
The brake fluid level is visible through the translucent wall of the Ford Transit master cylinder reservoir and should be between the min and max marks on the wall of the reservoir.
It is normal for the fluid level to drop slightly gradually due to brake pad wear, but care should be taken not to drop below the MIN mark.
If necessary, add brake fluid after cleaning the surface of the reservoir around the plug so that no dirt gets into the reservoir.
Use only brake fluid recommended for the brake systems of Ford Transit vehicles - if the wrong type of fluid is used, the system seals may swell and the brakes may fail.
If the liquid level in the reservoir drops sharply, you should immediately find and eliminate the cause.
It is recommended to periodically replace the brake fluid with the simultaneous replacement of all rubber seals and brake hoses - this is necessary because the brake fluid over time absorbs moisture from the air, which leads to a decrease in the boiling point of the fluid and internal corrosion of the brake system parts.
Brake fluid replacement is carried out by bleeding the brakes. Bleeding is also carried out in the event that it is necessary to remove air from the Ford Transit brake system that got there after replacing or disconnecting any of the parts or due to an unacceptable decrease in the level of brake fluid in the master cylinder.
Before starting work, make sure that all pipes and hoses in the system are in good condition and that the connections are securely tightened.
If air has entered the system due to a decrease in the liquid level in the master brake cylinder, before bleeding, it is necessary to find and eliminate the cause of the leak, because otherwise, the fault will be repeated immediately.
If only one of the circuits of the Ford Transit brake system is damaged (for example, when replacing the brake caliper), it is sufficient to bleed only this circuit.
If parts of both circuits were disconnected (for example, when replacing the master cylinder) or if bleeding is performed in order to replace the brake fluid, then it is necessary to bleed the entire system. Pumping is usually started at the wheel furthest from the master cylinder.
Remove the rubber boot (cap) and clean the area around the bleed nipple on the wheel cylinder or caliper to be bleed.
Place a transparent vessel into which liquid and air will be displaced from the system, approximately 300 mm above the fitting.
Remove the plug from the Ford Transit master cylinder reservoir and add fluid to it. During pumping, periodically add fluid to the reservoir to maintain a sufficient fluid level.
If a special tube with a check valve for bleeding the brakes is used, connect the tube to the bleed nipple, and lower the other end of the tube into a transparent vessel.
If possible, position the receptacle so that it can be seen from the driver's seat. Open the union by unscrewing it half a turn.
Press the brake pedal fully and then slowly release it - the return valve will prevent air or waste fluid from flowing back into the Ford Transit brake system when the pedal is released.
Repeat this operation until a clear liquid without air bubbles begins to come out of the tube into the vessel. Tighten the bleed fitting and disconnect the tube.
If there is no tube with a non-return valve, put one end of a regular plastic tube on the bleed fitting, and lower its other end into a vessel with brake fluid so that the end of the tube is immersed in the fluid.
Open the bleed fitting half a turn and ask the assistant to intensively press the brake pedal, then keep the pedal pressed all the way.
Tighten the union so that the displaced air does not flow back into the Ford Transit brake system, and ask the assistant to slowly release the pedal.
Repeat this operation until a clear liquid without air bubbles begins to come out of the tube into the vessel. Tighten the bleed fitting and disconnect the tube.
If the entire Ford Transit brake system is being pumped, repeat the above procedure on each wheel brake (pump the wheel closest to the master cylinder last).
Remember to regularly add fluid to the reservoir. Front calipers with a fixed body and four pistons have three bleed nipples - these nipples should be pumped simultaneously by attaching three tubes to them.
How to bleed the brakes on a car with ABS
Before you start bleeding the brakes, you must study the instructions. Since the principle of pumping on a car with and without ABS may differ.
In cars that have in one unit: a block of hydraulic valves, a hydraulic accumulator and a pump, replacement of brake fluid and bleeding of the brake system with ABS is performed in the same way as bleeding the brakes on a car without ABS. To do this, you just need to turn off the system by pulling out the fuse. Bleeding of the circuits is carried out with the brake pedal depressed, the bleed nipple of the RTC must be unscrewed. The ignition is switched on and the pump expels air from the circuit. The bleed nipple is screwed on and the brake pedal is released. An extinguished ABS malfunction lamp is evidence of the correctness of your actions.
Bleeding of the brake system with ABS, in which the hydraulic module with valves and the hydraulic accumulator are separated into separate units, is carried out using a diagnostic scanner to read information from the ABS computer. It is unlikely that you have it. Therefore, bleeding brakes with ABS of this type, most likely, should be done by you at a service station.
Bleeding the brake system with ABS and with electronic activation systems (ESP or SBC) is carried out only under service conditions.
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Message KILLALLHUMANS »15 Feb 2012, 19:03
Message igorey »15 Feb 2012, 19:17
Message GARPUNOV »15 Feb 2012, 20:28
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Message KILLALLHUMANS »15 Feb 2012, 23:13
The question is accepted. Alexander Druz answers.
At the heart of the nano-pribluda is a threaded rod. For convenient rotation of the rod, there is a so-called finger - but it is more convenient to turn it with a spanner wrench or a head. On the other side of the rod, there is a washer that fits over the brake cylinder. This washer itself has a square-shaped hole - you can twist it in any direction. However, in order to create just the pressure on the cylinder, it is necessary to twist the central part with a fitted plate - a horn-type one will do. On the right side, these parts had to be turned in different directions, but on the left, both keys had to be turned to the left, which took a little more time.