11.6. Overlays of back disk brakes


1. Mark with paint the provision of back wheels concerning a nave. Thanks to it the balanced 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 right – is inadmissible. It can lead to uneven action of brakes. All overlays of one axis change at the same time.

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



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

1. Clear the directing surfaces, respectively, the place of landing of slips in the mine of the case a brush suitable for this purpose from soft metal and the vacuum cleaner, or wipe with 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 regarding roughnesses, measure disk thickness.
3. Check a boot (45) for cracks. Urgently replace the damaged boot since the got dirt quickly puts a support out of action. The brake mechanism with the fixed bracket at the same time has to be removed and disassembled in a specialized workshop.
4. Besiege both brake pistons special adaptation (031). Also the piece of wood (the hammer handle) will descend, however at the same time especially you watch to warping pistons and not to damage the surface of pistons and boots.


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

5. Apply a plastic bottle in which there was only a brake fluid to a suction. Do not apply drinking bottles. Brake fluid is poisonous, and it cannot be sucked away a mouth. Apply the soaking-up siphon. After change of slips the level of brake fluid 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 leads to corrosion.

At big wear of slips check ease of the course of pistons. For this purpose insert suitable wooden whetstone into a support and ask the assistant to press a brake pedal slowly. Brake pistons have to come easily to light and precipitate back. For check there has to 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 has to adjoin to a support of a back wheel. The brake piston has a ledge. This ledge the piston has to adjoin to the slanting party of a template, otherwise turn the piston.
9. Impose a template on the lower 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 the 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 lubricant.
10. Clear guides of slips in a support by means of a wire brush suitable for this purpose. At the same time do not damage a piston boot.
11. Insert slips into a support.
12. Only for cars with the ASR system: Put wear sensors on both slips. Curtail a wire of the sensor a spiral and connect to the plug on a support. It is allowed to put sensors only in transparent heat-resistant execution.
13. Impose crosswise springs and hammer the 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 m 110 N.' moment.

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

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

Prior to a run in 200 km avoid emergency brake application.

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