S-class W202 Mercedes

1993-2000 of release

Repair and car operation

W202 Mercedes
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Greasing system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. Ignition system
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
- 12. Brake system
   12.2. Anti-blocking system – ABS
   12.3. The additional equipment – ASR system
   12.4. Specifications of brake system
   12.5. Overlays of forward brake shoes
   - 12.6. Overlays of back disk brakes
      12.6.1. Check of thickness of brake disks and their lateral palpation
   12.7. Support
   12.8. Forward brake disk
   12.9. Back brake disk
   12.10. Brake liquid
   12.11. Air removal from brake system
   12.12. Brake pipelines / hoses
   12.13. Replacement of brake highways
   12.14. Brake shoes of the parking brake
   12.15. Adjustment of the parking brake
   12.16. Stoplight switch
   12.17. Diagnostics of malfunctions of brakes
   + 12.18. Wheels and tires
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electroschemes

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12.6. Overlays of back disk brakes


1. Mark with paint the provision of back wheels concerning a nave. Thanks to it the otbalansirovanny wheel after removal can be put on the place that balancing was not broken. Release wheel bolts, without lifting the car, then Raise behind the car and remove back wheels.

Change by places of internal and external slips, and also overlays of the left wheel with overlays of the right – is inadmissible. She can lead to non-uniform action of brakes. All overlays of one axis change at the same time.

2. Only cars with ASR system (Antiprobuksovochny system): take a wire of the sensor of wear (S10) from shtekerny connection (S10/3x1). Thus do not pull for a wire.
3. Beat out holding pins (41) of a support (32) suitable punch.
4. Remove cross-shaped springs.
5. Get slips by means of the vyzhimny lever, flat-nose pliers or a screw-driver If slips приржавели, the special stripper, for example, HAZET firms is necessary.



At the removed slips do not press a brake pedal, differently brake pistons will jump out of the case. If through an oversight it occurred, remove a support and bring together him in a specialized workshop.

1. Clear directing surfaces, respectively, a place of landing of slips in mine of the case a brush suitable for this purpose from soft metal and the vacuum cleaner, or wipe a rag with alcohol. Do not apply for this purpose the means containing mineral oil or the tool with sharp edges.
2. Before installation of slips feel a brake disk fingers about roughnesses, measure thickness of a disk.
3. Check a boot (45) on cracks. The damaged boot urgently replace, since the got dirt quickly puts out of action a support. The brake mechanism with the fixed bracket thus should be removed and disassembled in a specialized workshop.
4. Besiege both brake pistons the special adaptation (031). The piece of wood (the hammer handle) will descend also, however thus especially watch to warping pistons and not to damage a surface of pistons and boots.


At an osazhivaniye of pistons brake liquid is squeezed out from brake cylinders in a broad tank. Watch liquid level in a tank, it is desirable to suck away brake liquid a siphon.

5. To a suction apply a plastic bottle in which there was only a brake liquid. Do not apply drinking bottles. Brake liquid is poisonous, and it cannot be sucked away a mouth. Apply soaking-up siphon. After change of slips level of brake liquid should not exceed the maximum mark as because of thermal expansion liquid can be splashed out from a tank. The flowed-out liquid, dripping from the main cylinder, corrodes a paint and varnish covering that conducts to corrosion.

At big wear of slips check ease of a course of pistons. For this purpose insert into a support suitable wooden whetstone and ask the assistant to press a brake pedal slowly. Brake pistons should come to light and precipitate easily back. For check there should be the second slip in a collected opposite support.

6. Check 20-degree position of the piston. In specialized workshops for this purpose apply a template. As a rule, at removal of slips it is not necessary to turn pistons! Then adjustment is not obligatory.
7. Make a template of a cardboard or a tin according to the drawing.
8. The long party of a template should adjoin to a support of a back wheel. The brake piston has a ledge. This ledge the piston should adjoin to the slanting party of a template, otherwise turn the piston.
9. Impose a template on the bottom directing plane in a support. Position of the piston correct if the adjacent party (situation in 20 °) coincides with piston ledges. In case of need carefully turn the piston a screw-driver. To prevent peep of disk brakes, grease a reverse side of a brake slip, and also lateral faces of its basis with a thin layer of greasing.
10. Clear directing slips in a support by means of a wire brush suitable for this purpose. Thus do not damage a piston boot.
11. Insert slips into a support.
12. Only for cars with ASR system: Put wear sensors on both slips. A wire of the sensor curtail a spiral and connect to the tip on a support. It is authorized to put sensors only in transparent heat-resistant execution.
13. Impose crosswise springs and hammer holding pins.

Pins and springs are subject to replacement.

14. Put wheels so that the marking put before their removal coincided. Screw wheels. Remove the car from supports and tighten wheel bolts in a crosswise order with the moment of 110 N of m.

Vigorously repeatedly понажимайте on a brake pedal, will not feel yet strong resistance.

15. Check level of brake liquid in a tank, if necessary add to the maximum mark.
16. Carefully grind in new brake slips. For this purpose repeatedly, having dispersed the car to 80 km/h, затормаживайте it till speed of 40 km/h at weak pressure upon a pedal. Between braking let's to brakes cool down a little.

Before run in 200 km avoid emergency braking.

17. Overlays of brake shoes are special utility refuse and in each case before them to throw out, it is necessary to learn, whether it is authorized.