Wabco DIY repair

In detail: do-it-yourself wabco repair from a real master for the site my.housecope.com.

Dryer / unloading
WABCO, 932 400 024 0, (9324000240)
WABCO, 932 400 001 0, (9324000010) - (old number)
WABCO, 932 400 002 0, (9324000020) - (old number)
WABCO, 932 400 005 0, (9324000050) - (old number)
WABCO, 932 400 006 0, (9324000060) - (old number)
MERCEDES,

Repair kit - complete
SORL, RL3511DH-9, (RL3511DH9)
SORL, 3511 006 009 0-9, (35110060090-9, 351100600909)

Click on image to enlarge 查看大图

Repair kit - part of the pressure relief valve
WABCO, 932 400 000 2, (9324000002)
MERCEDES, A 000 430 14 15, (A0004301415, 0004301415)
FSS, 01.120.50.2, (01120502)
TRUCKTECHNIC, WSK.63.40
EBS, EKWA.63.40

Click on image to enlarge 查看大图

Repair kit - part of the regulator
WABCO, 432 410 001 2, (4324100012)
MERCEDES, A 000 430 02 15, (A0004300215, 0004300215)
FSS, 01.120.01.2, (01120012)
SORL, RL3511AM-A-9, (RL3511AMA9)
SORL, 3511 003 004-9, (3511003004-9, 35110030049)
TRUCKTECHNIC, WSK.63.5
EBS, EKWA.63.5

Click on image to enlarge 查看大图

- We offer a solution in the event of a breakdown of the WABCO TEBS-E trailer modulator.

- You can purchase a new modulator, or remanufactured with a 6-month warranty, or purchase a self-repair kit, namely a valve block or a repair kit for the pneumatic part of the modulator.

- When buying a remanufactured modulator: we send you a remanufactured one (for 30 thousand rubles), you install it at your place, and send your not working one to us (upon receipt, we return 5 thousand rubles to you)

- It is diagnosed very simply: if it “communicates” and does not “hiss”, but shows various errors, then this is the valve block => we disassemble the modulator and change the valve block.

Video (click to play).

- If it works and “hisses” - replace the repair kit for the pneumatic part => change the repair kit.

- If it doesn’t get in touch and doesn’t work - most likely the brains (the board under the plastic case) —there is no point in repairing => we take from another dead modulator with a working board and move it to the one we want to restore.

You can always install the modulator or come for diagnostics to our service center company PNEUMOTECHTSENTR.

The brake pressure regulator is an important element of the car, it provides braking stability, this is the key to your safety. If it malfunctions, it does not always have to be replaced, sometimes you can do with replacing the gaskets and seals that are included in the repair kit.

Air leakage into the dryer discharge is one of the most common drain valve malfunctions in the Wabco, Knorr-Bremse air brake system. The repair is carried out by replacing the repair kit (RMK).

On SCANIA, MB, MAN, RVI, Iveco, MAZ and others, the air pressure generation is mechanically controlled by the dryer until the required pressure is created. Under the influence of air, the diaphragm in tandem with the plunger opens the outlet valve, through which air from the receiver enters the discharge hole.

Since 2013, on SCANIA, MB, MAN, RVI, Iveco trucks, the solenoid valve is mainly responsible for controlling the air dryer. Regeneration is performed by supplying air with a solenoid valve actuated by a signal from the electronic unit. This process is controlled by the APS unit (air preparation system).

To replace the repair kit, you need to do the following:

dismantle the damper from the dehumidifier discharge
install a bolt with a nut screwed onto it on the sound signal holder
turn the nut until the retaining ring is free
remove the retaining ring
take out the valve and replace
the assembly is carried out in the reverse order

The M14 bolt puller and washer with nut had to be held on the bracket, which led to the idea of modifying it.

As a result, replacing the dryer repair kit has become much more convenient, and the remover has acquired a serious look. In the photo there is a puller before and after the modernization (on the right is a puller with a Wabco dehumidifier sleeve to which the muffler is attached).

The height of the sleeve is 25mm, and the height of the welded plate is 4-5mm. The plate serves as a guide. As a result, the height is 29-30mm.

In the head of the bolt (М14 L-55 mm), cut a slot for the stability of the bolt on the horn bracket.

This is how the assembled puller looks like. For repairs, it is enough to install a puller and unscrew the nut with a 22 wrench until the locking ring is released.

This is what we see in the end result. For repairs, it is enough to install a puller and unscrew the nut with a 22 wrench.

This method can be used all depending on the location of the APS unit on vehicles of different brands and models.

We are selling RMK dehumidifier article 4324100012 of European production by WABCO. It will be used for assembly on a conveyor of trucks SCANIA, MB, MAN, RVI, Iveco, DAF and others.

Our store sells quality spare parts at the best prices. The prices in our store and the quality of spare parts will pleasantly surprise you. If you have any questions, our specialists will select the RMK by VIN-code or nameplate from the dryer. You will also find special offers and a flexible system of discounts.

The service center "SERPRI-AUTO" is an official service partner with the maintenance of the warranty obligations of the WABCO company.
WABCO official website

The WABCO manufacturer's warranty for all products - EBS modulator unit (ABS), brake valve, valve, WABCO caliper - 2 years from the date of production.

The standard warranty of the manufacturers of trailers and semi-trailers SCHMITZ, KRONE, KOGEL, WIELTON, GRUNWALD, KASSBOHRER, NURSAN, PANAV, BODEX, MEGA, NOVTRAK, TONAR, tanks of the Betsema, Cobo, GRAZ brands and others, as a rule, is 1 year.

Few Russian carriers use the opportunity to apply under the WABCO warranty after the warranty period from the semi-trailer or trailer manufacturer has expired.

The release date of the EBS modulator unit (ABS), brake valve or valve is indicated on the nameplate - week / year number. Example: WABCO 4801020330 EBS modulator unit, nameplate for WABCO 4801020630 EBS modulator unit, in this case the unit issue is 07 week 2016, warranty up to 7 weeks 2018.

The warranty for WABCO products also applies to spare parts purchased during the post-warranty period.

The SERVICE-AUTO service center offers you a unique opportunity to carry out diagnostics of all WABCO products at the stand, without providing a trailer or semi-trailer.
If your trailer or semitrailer breaks down in any region of Russia and cannot be repaired and diagnosed on site, you can send by the transport company to our address - EBS modulator, brake force regulator, main brake valve, valve or WABCO crane and in within 2 days we will make diagnostics and, if necessary, repair.

List of main cranes and WABCO modulators (WABCO) for testing at the stand:

Welcome to the online store of spare parts for semi-trailers and trailers! We offer a wide range of auto parts for semitrailers and trailers SCHMITZ (SCHMITZ), KRONE (KRONA), KOGEL (KEGEL), WIELTON (WELTON), GRUNWALD (GRUNWALD), FRUEHAUF (FRUEHAUF), KASSBOHRER (KESBOHRER) (BODEKS), SCHWARZMULLER, LAMBERET, TRAILER, PACTON, TONAR, MAZ, NEFAZ, ChMZAP, SZAP, POLITRANS, MANAK, KAMASTROY TVER. In the store you can find air suspension diagrams of the WABCO (WABCO), KNORR-BREMSE (KNORR-BREMSE), HALDEX (HALDEX) systems, specifications for the BPW axle (BPV), the SAF semi-trailer axle (SAF), the GIGANT axle, the TONAR axle,
hydraulic cylinders HYVA (KHIVA), hydraulic cylinders BINOTTO (BINOTTO), hydraulic cylinder PENTA (PENTA).
Buying goods in our online store, you can be sure of its quality - after all, we work only with trusted manufacturers.

Repair kit - complete
SORL, RL3511DH-9, (RL3511DH9)
SORL, 3511 006 009 0-9, (35110060090-9, 351100600909)

Click on image to enlarge 查看大图

Wabco is a leading manufacturer of control and safety systems for commercial vehicles.Thanks to wabco, most commercial vehicles are equipped with electronic air suspension control, transmission automation, collision mitigation with active braking and other electronic equipment to ensure the stability and safety of trucks.

But, even in spite of the high reliability of these systems, they can also fail. And, as practice shows, only professional craftsmen can repair wabco systems using specialized equipment. Therefore, if you find problems in the security and traffic control systems, you should not try to repair wabco yourself, but rather contact our service center.

repair of EBS Wabco (electronic - pneumatic braking system);
repair of AEBS Wabco (autonomous emergency braking system);
ESC Wabco repair (stability control system);
repair of ABS Wabco (anti-lock braking system);
repair of CMS Wabco (collision mitigation system with active braking);
repair of ECAS Wabco (electronic control system for external suspension);
repair of AMT Wabco (automation system for manual transmission);
warranty maintenance.

The federal network of service station "TRUCK Center" trucks repairs Wabco systems using original equipment and software recommended by Wabco. Thanks to this, we can accurately determine the technical condition of the central units, components and other component systems and quickly eliminate problems.

repair and diagnostics of wabco central control units;
replacement of wheel speed and floor level sensors;
replacement of modulators;
replacement of valves;
replacement of bushings, sleeves, pads;
replacement of the brake valve and other components of various wabco systems.

When repairing wabco units, replacing sensors, valves and other components, our company uses only certified spare parts.

Short circuit, mechanical damage to one of the components of wabco systems;
Liquid or moisture penetration into the system;
Depressurization of the control unit and its exit from the working state due to oxidation under the influence of moisture;
Operation of freight transport in harsh weather conditions.

TRUCK Center can provide accurate diagnostics of control and safety systems, quickly repair Wabco units, sensors and other component systems. With us you can be sure that your truck traffic control system will work stably, for a long time and without interruptions.

WABCO brand products are in high demand. Our company produces WABCO repair blocks and accessories. With the help of this system, the air suspension in the truck is electronically controlled, the transmission is automated, fast braking is functioning, and so on.

Trucks that require WABCO repair, system diagnostics, we provide qualified "ambulance" using equipment recommended by the manufacturer WABCO. Repair work is carried out by specialists of a narrow profile, who have competence in the blocks of this system. Repair of trucks with WABCO system may be required when:

depressurization,
moisture penetration,
the formation of condensation in the control unit,
short circuit in the electrical system,
blows,
damage to individual elements.

In the Flagman car service, they will quickly find the cause of the problem, diagnosing WABCO units, repairs are carried out as soon as possible. We are a WABCO Certified Service Partner and are authorized to carry out warranty repairs, while we have dealer diagnostic equipment, and our employees have received special training.

You can sign up for service by calling 8-983-510-91-99 or by filling out the form below

On July 26, 2018, a BPW Group seminar was held on the Flagman territory.BPW-INFOMOBIL, equipped with the latest technology, opened its doors for our employees. Further in the article details about the seminar, as well as photos from the event! Do not miss!

We are glad to inform you that now the order of a tow truck is available on the site! You get the lowest cost of the service in the region, and in case of further repairs at the "Flagman" service station - an additional 20% discount on tow truck services!

Autonomous temperature recorders (thermal recorders) of the DataCOLD ™ line have supplemented the equipment catalog on the site.

630088, Novosibirsk, Severny proezd 9 koprus 1
Tel./fax: 8-800-500-07-98, +7 (383) 383 08 50
Service registration: +7 (983) 510-91-99

The pneumohydraulic booster is installed on modern MAZ and KAMAZ vehicles.

The unit has many different seals and cuffs.

Therefore, over time, breakdowns of the repair kit occur. The repair of the MAZ CCGT unit will help to solve the problem.

In most cases, working fluid and air will escape through the systems.

Of course, you may experience other malfunctions of the MAZ PGU.

In our article we will try to consider all the options for breakdowns and give detailed instructions for the repair of CCGT MAZ 4370, Bychok, KAMAZ.

Before we start repairing the unit, we will consider the causes of its breakdown, as well as options for malfunctions.

The CCGT unit and then the MAZ clutch booster fail because:

Over time, almost every O-ring swells, the surface of the part becomes thinner;
The clutch actuator is incorrectly adjusted;
In the working cylinder, cuffs and other elements of the repair kit are worn out;
The clutch release fork bends, its sleeve wears out.

Due to the breakage of the sealing rings, bypass occurs, a kind of "hiss", and then the leakage of the working fluid.

If the MAZ CCGT unit is not repaired in time, problems will arise with the MAZ clutch booster over time.

How to pump a CCGT unit for MAZ, read below.

When repairing a part, it must be removed from the vehicle.

On KAMAZ, CCGT is installed on the right, on MAZ - on the left along the way.

Then we take the key for 14, unscrew the fitting of the hose, tubes (here the working fluid).

With a 17 key, remove the CCGT by unscrewing 2 screws.

We take a 13 key, unscrew the air intake screws, dismantle, unscrew the inlet and outlet valves.

Using the hexagon, we unscrew the screws, disconnect the case of the MAZ 4370 CCGT unit, remove the piston, carefully unscrew the breather.

We also dismantle the bypass valve, O-rings, piston seals, retaining ring.

The MAZ clutch release piston, the piston seal housing, the cuff are carefully removed.

We hammer in a small plug instead of the rod sealing piston in the MAZ clutch booster. We wrap the grease nipple instead of the MAZ bypass valve.

We squeeze out the piston. After you pump the CCGT at MAZ, wash all the parts of the pneumatic hydraulic booster in kerosene or gasoline. If some elements are worn out, we replace them with new ones (cuffs, rings).

We mount the cuff on the piston, replace the cuff in the ring of the seal housing. Install a new one on the clutch release piston. Only in this way, over time, malfunctions will not appear at the MAZ PGU.

We mount the membrane, assemble the CCGT unit. Valve block, air inlet cover are installed last.

We attach the pneumohydraulic booster to the car, add fluid to the hydraulic drive and pump it up.

The problem is not solved? Repair the CCGT for MAZ.

When replacing a part, remember to check the stroke stem:

Move the stem away from the lever;
Move it gently to the side;
We turn the MAZ clutch lever from the PGU MAZ 4370;
Measure the distance to the start of the arm.

The distance should be more than five cm.If the indicator is less than fifty mm, we recommend repairing the MAZ CCGT unit further:

We remove the lever from the MAZ shaft, fix the MAZ pneumatic clutch booster one slot closer to the body;
Carefully install the CCGT rod into the drive lever.

If you notice other malfunctions in the MAZ CCGT unit, we advise you to replace the repair kit. If the problem is not resolved - in our catalog you can always find new spare parts at the lowest prices.

If your air suspension compressor flatly refuses to work and by a lucky chance you have a few hours of free time, then I suggest getting out the dusty tools and giving your compressor a new life. And now we will consider how to do this as quickly and efficiently as possible.

So, the defective compressor is lying on the table, you are already angry and tired (it is not so easy to remove the compressor from the car, especially without breaking anything), but still full of determination? Wonderful! Let's start then.

What we definitely need:

Torx T30 key. I strongly recommend using a high-quality wrench with a good wrench - you can break a lot of poor-quality ones, but you still can't achieve the goal, because the bolts we need sit on thread glue and, moreover, often "sour"
Slotted screwdriver
Soap solution
Rags or cotton wool

You may also need a drill, a thin drill (3-4 mm), side cutters, a file, a 10mm head and many other useful tools, depending on the condition of your compressor.

Before repairing the air suspension compressor, it is advisable to wash it well in order to prevent dirt from entering the pneumatic system, which can make all our work in vain. For washing, you can use soapy water and a stiff brush, such as an old toothbrush. It is highly undesirable to use a wire brush or pressure washer. It is best to set organic solvents aside to avoid damaging the plastic and rubber parts of the pneumatic fittings.

Next, we begin to disassemble. The first step is to remove the cylinder assembly with the dryer block and dump valve. To do this, we are trying to unscrew the two T30 bolts that we mentioned earlier.

After the bolts are unscrewed, we remove the temperature sensor and put it aside. On some air suspension compressors, for example on the VW Touareg and Range Rover Vogue, in order to remove the temperature sensor, it is necessary to additionally unscrew the fixing bolt on the back of the cylinder. After that, we can remove the cylinder and look inside.

Inside we see a piston on which the piston ring is worn. The piston itself rotates on the connecting rod. We are interested in three things here.

The first is the ease of rotation of the rotor of the electric motor. To do this, we try, by pulling or pushing on the piston, to scroll it. The rotor should rotate easily and without biting. If it rotates heavily and unevenly, or does not rotate at all, then with a greater degree of probability we can say that the cause of the compressor malfunction was the melting of the rotor windings, which led to its sticking. In this case, we recommend replacing the compressor with a new one.

Next, we check the condition of the bearing on which the piston is rotating. It is checked by staggering the piston along the axis of rotation of the bearing. If the backlash is 1-2 mm in each direction, then everything is in order with the bearing, if the backlash is greater, then it is recommended to replace the bearing.

To replace it, it is necessary to drill out rivets on the end flange, remove it and unscrew the bolt securing the bearing. Note that the thread of this bolt is LEFT! Then it is necessary to remove the piston and bearing assembly. The bearing must be pressed out of the piston. To do this, you must use a specialized puller. DO NOT use a hammer, etc. to press out the bearing. The piston is aluminum and can crack easily. Then we carefully press in the new bearing.

The next thing we pay attention to is the cleanliness inside the cavity in which the piston moves. If there is a slight plaque on the inner walls, then we have nothing to worry about. To remove it, use a soapy solution.In extreme cases, weak organic solvents (such as gasoline) may be used, but under no circumstances should the solvent come into contact with the plastic and rubber parts of the compressor.

If we find a large amount of dirt (and this dirt is not a debris from the cylinder and piston ring), or, even worse, this dirt is oily, then everything is a little worse. The only way this dirt could get inside is the air supply lines. They must be carefully checked and, if necessary, repaired or replaced.

The last thing we are interested in is the state of the piston ring and cylinder walls. If we are going to install the air suspension compressor repair kit, then this item can be skipped. If we hope for a miracle (and miracles happen), then it is necessary to carefully examine the cylinder walls for the absence of scratches and wear. Small scratches are allowed on the cylinder walls, which are not perceptible by touching with a finger. If the cylinder has deep scratches or grooves (especially deep in the cylinder where maximum compression is to be achieved), the cylinder must be replaced. If the cylinder has no signs of wear, then we next check the condition of the piston ring.

If the cylinder does not have scratches, then most likely you will not find them on the piston ring either. Use a vernier caliper to check the condition of the ring. The ring width should be 4.75 mm. Wear up to 0.05 mm is allowed, and then it is recommended to replace it.

If during the check it turned out that the engine, cylinder and piston ring are in order, then either we disassembled the compressor in vain, or for its further verification we need a specialized stand where we can accurately determine the correct operation of the electric motor and the air discharge system, as well as the places of possible leaks air. To do this, we recommend that you contact a specialist (for example, us) or replace the compressor with a new one (in case you are sure that it is faulty).

If we do not replace the desiccant unit with a new one, then it is also recommended to recycle it. We will consider the features of the bulkhead of the dryer block in another article.

Compressor assembly is carried out in reverse order. All worn out and broken parts are replaced with new ones whenever possible. If the quick-release couplings were damaged during the repair, they must also be replaced! All pneumatic tubes must be fully inserted into the connections.

When installing the piston ring, pay attention to the correct installation. There is only one position on the piston in which it will work correctly.

Please also note that unnecessary details MUST NOT be left behind.

Hello dear! For about 4 years I have been professionally engaged in diagnostics and repair of pneumatic equipment of trucks and buses.
And now about why I came here: I decided not only by deed, but also by advice to help people who have problems with brakes, ABS, EBS, ECAS, and other nonsense that “good” manufacturers stuffed with their “war horse” their cargo products, and which, every now and then, breaks down.
In short, write if you have problems with these questions. I will answer, if possible, all questions. As the ad says: "Welkam!"

Edited by bremsemaster - Apr 04 2017 00:29

And you, as they say, do not get sick!
Demand for backfill: how many outputs are there on the Knorov main brake: 4 or 5? or more? and under what numbers? The most common system for connecting the “master” is 4 outputs numbered “11,12,21,22”. But there are also 5 outputs, where, in addition to the above outputs, there is a fifth one with the number “4”.
So far, after reading your message, I realized the following: on an “empty” car, the pedal is easy to press, but on a “full” car it is tight.If there are 4 outputs on the “main”, then the described situation cannot exist in principle, since when you press the brake pedal, only the return springs of the pistons are compressed in the crane mechanism, the force of which is clearly independent of the load of the machine (after all, this is not a hydraulic drive, as on a "passenger car", where, in order to brake, you need to "squeeze" the fluid). But, if there is a fifth exit with number “4”, then the “main” mechanism is influenced not only by the driver (by the pedal), but also by the regulating pressure from the rear brakes, which depends on the load (the higher the load, the higher the pressure, respectively). Because of this, the pedal effort can be different. Therefore, for now, I assume that you have 5 outputs on the tap.
If my reasoning is not correct, and you have 4 outputs, then send me the number of the Knor crane, and, if possible, the old Vabkov one - I will understand more specifically.

And now - INTERESTING INFORMATION FOR EVERYONE!

There are such “magic” UNECE RULES №13, which prescribe the requirements for the pneumatic brake system to the automakers. So here:
in accordance with the requirements of these rules, the pneumatic brake valves must be interchangeable with valves of the same type from another manufacturer.

What does this mean: i.e. You did absolutely right: you replaced the "wabko" with the same type of "knorr" tap. This is permissible and does not constitute a redesign if the Knor crane has the same characteristics.

And in general: if there is a “force majeure” on the road, you can even put on a “Kamaz” crane if it fits to the frame, and also the exit numbers match. This, if necessary, as they say, “reach out” to the house.

Read also: 5hp30 DIY repair

VIN: YV2A4B2A4WB208055
The spare parts seller said that the number of the crane by fault is determined as:
WABCO 4613150420.
KNORR ii 36174000 (Now installed on the machine).
The original number for the Volvo program is 20410545.
All numbers according to the seller of spare parts.
By the way, how are the highway numbers 11,12,21 and 22 decoded?

With the tap, everything is clear. The last question: does the pedal force increase in steps, or smoothly, as you press it?

Regarding the symbols on the cranes:

Greetings Sergey.
Sorry for the delay in reply, worked.
With increasing pressure, the effort on the pedals increases smoothly. The brakes are applied quite abruptly and with little or no pedal free play.
Thanks for the detailed answer, but could you still
to clarify more specifically, what do the numbers 11,12,21 and 22 mean?

11 - air supply from the receiver of the primary circuit (rear brakes)
12 - air supply from the secondary circuit receiver (front brakes)
21 - rear brake control output
22 - front brake control output

and now - according to the situation.
You wrote to me that you supplied a dehumidifier with an 8.5 bar cut-off. I checked by "fault" - the machine must have a dehumidifier with a cut-off of 12 bar. in fact, as you suspected, is the cause of the "tight" pedal.
for info: Wabco single chamber dryer with 12 bar cut-off for your machine - 432 420 002 0; 432 410 087 0

Model DAF FT-95400 VIN- XLRTE47WSOE384441

A short excerpt from the description of the ECAS system:
Minor errors, believability errors and major errors are common.

Minor Bugs:
• Failure of the height sensor if the same axle has a different height sensor.
• Failure of one pressure sensor.
• In some cases - failure of both pressure sensors
• Error in the data of the electronic control unit.
The system responds as follows:
• the signal lamp comes on.
• the error is stored in the non-volatile memory of the control unit.
Minor errors enable limited ECAS function. The system will not be turned off. After the error has been cleared, the system will return to normal operation.

Likelihood error
A plausibility error causes the system to be temporarily shut down.
Due to the lack of input signals from the sensors or
output signals of solenoid valves, the control unit cannot detect the error.This could mean that there is an incorrect error based on signals received from altitude sensors whose signals are not plausible.
Failures that can cause a Likelihood Error:
• the ECAS solenoid valve is leaking, or
reduced reference pressure.
• the ECAS solenoid valve remains in
up or down mode, although
the management process was completed.
• leaks in the system.
System Response to Likelihood Errors:
• the signal lamp comes on.
• the error is stored in the non-volatile memory about
control unit.
• The current control process and position alignment are interrupted.

Serious Errors
A serious system error that will cause the system to shut down for a long time. They fall into two categories.
Category I
ECAS can no longer execute functions.
Category I includes these errors:
• error in the program of the control unit.
• the battery element in the control unit RAM is defective.
• the valve relay does not work (open circuit or short circuit).

Category II
Emergency operation of the system is possible via remote control.
Category II includes errors:
• parameter error of the control unit:
• the parameter value has changed or the parameters have not been set on the control unit.
• Calibration error:
• calibrated sensor readings outside their permissible measurement limits.
• the parameters of the calibration data are not correct (their total number has changed).
• an inaccurate calibration has been made.
• open circuit or short-circuited circuit on the solenoid valve or in a cable between the control unit and the solenoid valve.
• Failure of all height sensors on one axis.
• resistance of the height sensor or
its meaning is incorrect or missing.
• incorrect initial data of the manufacturer.
The system responds to Serious Errors as follows:
• the signal lamp comes on.
• the fault is stored in the non-volatile memory of the control unit.
• The entire system is automatically shut down.
If these errors cannot be removed, the control unit must be replaced.

As a result, what can I say: most likely, you have a “serious” error of the first category, if the system is not controlled by the remote control.
This system has a function of computer diagnostics, i.e. You can, by connecting to the on-board computer using a universal scanner, determine what the problem is and where the error came from.
if you pull out the fuse and the lamp lights up yellow - you de-energize the ECAS control unit and it does not report any errors.

so, I advise you to make a computer diagnostics as soon as possible.

The most common reason for replacing a Wabco air dryer drain valve (bleed valve) repair kit is to leak air into the dryer discharge.

On Scania 4-series trucks, the air regeneration control was carried out mechanically upon reaching the pressure to which the dryer was adjusted. The impact was transmitted to the diaphragm and the plunger, which ensured the opening of the exhaust valve. The plunger opened the outlet valve through which the air from the regeneration receiver was released to the outlet (desiccant discharge).

To replace the Air Dryer Vent Valve Repair Kit on a 4 Series vehicle, you must remove the dryer assembly.

On Scania PGR trucks, the air dryer outlet is controlled by a solenoid valve. Regeneration is carried out by supplying air with a solenoid valve activated by a signal from the electronic unit. The drain valve opens when the water separator filter is being regenerated. In this way, the pressure is released and the air is released from the dehumidifier. The whole process is controlled by the APS unit (air preparation system).

On a PGR series vehicle, the air dryer drain valve repair kit can be replaced without removing the dryer that is part of the APS unit.

For replacing a repair kit, a simple device has proven itself well, with the help of which the repair process takes several minutes. And the production does not take much time and labor.

Replacing the Wabco air dryer repair kit is as follows:

remove the muffler from the dehumidifier discharge;
install a bolt and nut on the horn;
unscrew the nut until the retaining ring is free;
squeeze and remove the retaining ring with ring pullers;
take out the valve from the air dryer, replace it;
the assembly is carried out in the reverse order, using our fixture to install the retaining ring.

In the beginning, a trial puller was made using an M14 bolt, a thick wall washer and an M14 nut. He fulfilled his function, but the work did not bring pleasure. It always had to be centered and held on the horn bracket.

However, there are no boundaries to perfection, so the device has undergone a simple revision. As a result, replacing the dryer repair kit has become much more convenient, and the remover has acquired a serious look. In the photo there is a puller before and after the modernization (on the right is a puller with a Wabco dehumidifier sleeve to which the muffler is attached).

Here are all the elements that make up the device considered in this article:

bolt М14
nut М14
a bushing with a through hole Ø14.2-14.5mm and a welded plate serving as a guide (a plug from some kind of caliper was used).

The height of the sleeve is 25mm, the height of the welded plate is 4-5mm, the inner diameter is 29-30mm. The plate acts as a guide. The total height is 29-30mm

Bolt M14, length 55-56mm. A slot is made in the bolt head with a grinder for stability on the horn bracket. The slot is 5mm wide and 2mm deep.

This is how the assembled puller looks like. For repairs, it is enough to install a puller and use a 22 wrench to unscrew the nut until the locking ring is released.

This device has already performed more than one replacement of the repair kit for the reset valve of the Wabco dryers on the Scania car.

True, starting in 2013, the manufacturer changed the location of the APS unit on the car. This can be seen in the figure below. But even with this arrangement, you can use the described device. Although there are still enough cars with the old arrangement of dehumidifiers.

We repair modulators WABCO and KNORR

- primary diagnostics.
- complete disassembly of the modulator.
- check on the pneumatic stand WABCO or KNORR.
- replacement of all rubber and silicone seals.
- replacement of contact groups of electrical circuits.
- sandblasting and painting the body.

Resolution of the Government of the Russian Federation of July 30, 2014 N 730 Moscow

"On Amendments to the Technical Regulations" On Requirements for Emissions by Automotive Equipment Put into Circulation in the Territory of the Russian Federation, Harmful (Polluting) Substances "and the invalidation of the Decree of the Government of the Russian Federation of 20.01.2012 N 2"

“For diesels, gas engines, gas diesels and dual-fuel engines (in operation on gaseous fuel) intended for installation on vehicles of categories M1 with a maximum mass over 3.5 t, M2, M3, N1, N2, N3, - technical standards emissions required by UN Regulation N 24-03 with Supplement 1 (only for diesel engines and gas diesel engines) and UN Regulation N 49-05 with Supplement 6 (emission level B1), when applied, it is possible to disable the engine torque limiting function while maintaining the latch function errors if a separate ID number is assigned to the OBD control program with the engine torque limiting function disabled.

Dehumidifier Wabco designed to remove moisture from the air in brake systems. In our country, wabko dehumidifier used in MAZ, KAMAZ vehicles 6460, 6520, and Wabco has been supplying its parts to Russia since 1992.

The device of the Wabco air dryer includes special granules that absorb moisture from the air, through which compressed air is blown. Due to this, water vapor and dirt are removed. These special granules placed in a replaceable filter that must be regularly cleaned and refurbished. Replaceable filter maintenance is carried out by directing dry air in a compressed state at the very beginning of unloading in the opposite direction - through absorbent granules into the air.

The Wabco dehumidifier is located in the pneumatic drive of the brakes of the machines and turns on automaticallyif the temperature dropped to 7 degrees. When the temperature reaches a certain desired value, the device automatically turns off. In addition to attention to the tightness of the pneumatic drive, the Wabco dehumidifier does not require special special maintenance and worries.

In winter it is advised to turn off the engine after the so-called “sneezing” of the pressure regulator, otherwise the dehumidifier may freeze.

Life time of a Wabko air dryer, subject to proper care and use, is 2 years... The injection should not be more than 50% of the operating time of the Wabko air dryer, only under this condition is it possible complete cleaning of compressed air... The remaining half of the operating time of the dehumidifier should be taken up by purging the desiccant element to restore its ability to absorb. Condensate control in receivers helps to monitor the efficiency of the Wabko air dryer. Today, Wabko dehumidifier models come with integrated pressure regulator, which increases the speed of the regulator and reduces the number of pneumatic hoses.

Exists single and double chamber dehumidifiers Wabko. The modification is determined by the performance of the compressor and the wishes of the customers of a particular vehicle. If the capacity is 500 l / min and the switch-on time reaches 50%, then Wabko single-chamber dryers are used. Two-chamber are used with a capacity of 600 l / min and an on-time from 50% to 100%.

Video (click to play).

Service-16 company will deliver you fast and guaranteed quality Wabco dehumidifiers from a direct supplier. You can make an order by phone in Naberezhnye Chelny: +7 (8552) 44 87 37, +7 917 934 96 68, +7 987 416 26 66

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