Mercedes W124

since 1985-1995 of release

Repair and car operation

W124 Mercedes
+ Governing bodies and control devices
+ 2. Maintenance (diesel engines)
+ 4. Repair of 6-cylinder petrol SOHC engines
+ 5. Repair of 6-cylinder petrol DOHC engines
+ 6. Repair of the diesel engine established in the car
+ 7. Major maintenance of engines
+ 10. System of injection of BOSCH CIS-E fuel (KE-JETRONIC)
+ 11. System of injection of BOSCH HFM fuel
+ 12. Fuel system of diesel engines
+ 13. Fuel system of diesel engines
+ 15. System of ignition of 4-cylinder petrol engines
+ 16. System of ignition of four-cylinder petrol engines
+ 19. Mechanical transmission
+ 20. Automatic transmission
   22.2. General information
   22.3. Pumping of hydraulic brake system
   22.4. Brake pipelines and hoses
   + 22.5. Replacement of forward brake shoes
   22.6. Replacement of back brake shoes
   22.7. Forward brake disk
   22.8. Back brake disk
   22.9. Forward brake support
   - 22.10. Support repair
      22.10.2. Models with a motionless support with two pistons
   22.11. Back brake support
   22.12. Main brake cylinder
   22.13. Vacuum amplifier of brakes
   22.14. Unilateral valve of the vacuum amplifier of brakes
   22.15. Adjustment of the parking brake
   22.16. Brake shoes of the parking brake
   22.17. Pedal of the parking brake
   22.18. Cables of the parking brake
   22.19. Stoplight switch
   22.20. Anti-blocking system (ABS)
   + 22.21. Elements of anti-blocking system
   22.22. The vacuum pump on models with diesel engines

22.10.2. Models with a motionless support with two pistons



Do not unscrew the bolts, fixing both parts of a support to each other. In this case there can be a tightness loss, and the support will leak.

1. Being careful, clear a support of a brake dust and dirt.
2. Note an arrangement of pistons in a support in order that it was possible to establish them correctly on the places.
3. Take pistons from a support for what it is possible to use air under the low pressure submitted to the brake cylinder through an opening for a brake hose. Thus instead of brake shoes establish wooden whetstone. Remove from pistons dustproof covers.
4. Using a small screw-driver, take sealing rings from flutes in support openings.
5. Wash out all details in methyl alcohol or pure brake liquid and wipe them. For pro-cleaning of tubes and openings use the compressed air.
6. Check a condition of all details of a support and replace the worn-out or damaged details.
7. Special attention turn on the cylinder and the piston. In the presence of scratches, рисок, wear or dot corrosion it is necessary to replace the piston and the cylinder, and it means that it is necessary to replace a support assembled.
8. Irrespective of a condition, replace all rubber consolidations.
9. At installation check that all details pure and dry, and that each piston is established in the opening.
10. Dip pistons and new sealing rings of pistons into brake liquid and apply a thin film brake liquid on openings for pistons in a support.
11. Establish sealing rings in support openings.
12. Establish dustproof covers on pistons so that internal diameter of a cover was included into a piston flute.
13. Establish a dustproof cover on the piston so that internal diameter of a cover was included into a piston flute. Being careful and turning, insert the piston into a support and one-times but insert an external edge of a dustproof cover into a support before its fixing.
14. Similarly establish the second piston in a support.


1. Using the corresponding tap, clear a carving in an opening of a directing finger.
2. Screw a support on the connecting coupling of a brake hose.
3. On models with a mobile support with one piston establish a support on the holder of a support and screw in the new top bolt, a fixing directing finger. Tighten a bolt of fastening of a directing finger the demanded moment. Thus, using a thin wrench, hold directing finger from a provorachivaniye. Do not damage a protective cover of a directing finger.
4. On models with a motionless support with two pistons establish a support on a place and fix it new bolts, having tightened them the demanded moment.
5. On all models tighten a connector the ny coupling of a brake hose to a support. Remove a clip pressing a brake tube.
6. Establish brake shoes and remove air from hydraulic brake system. If all precautions were undertaken at work with hydraulic brake system, means, it is necessary to pump over only the corresponding forward brake.
7. Establish a wheel, then lower the car on lands and tighten bolts of fastening of a wheel the demanded moment. Check level of brake liquid.