Mercedes-Benz:: S-class W202:: Overlays of front brake shoes

11.5. Overlays of front brake shoes

Removal

PERFORMANCE ORDER

1. Mark with paint the provision of forward 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 put in front the car on supports and remove forward wheels.
2. Pull a hand a support of the brake mechanism outside owing to what brake pistons will a little be wrung out.
	3. Open a cover (56) of shtekerny connection for what raise the screw-driver the holding side ledges a little. Be not overzealous at the same time.
4. Separate the plug (57) of a wire of the sensor of wear of slips (S10/1). At the same time do not pull for a wire.
	5. Unscrew the lower fixing bolt of the case of the brake piston, holding the directing bolt (37) Rozhkov a key.
	6. Cast away the case of pistons (34) up and a wire fasten it to a suspension bracket spring. When tilting you watch that the directing bolts were not bent. Do not use the case of pistons at all to change an angle of rotation of the operated wheels.
	7. Take overlays of blocks (43) from a support of the brake mechanism. Additional components: 44 – spring bracket; S10/1 – a wear sensor wire.
8. Take the wear sensor from the slip basis. The sensor is usually on an external slip. In modification of "taxi" the sensor costs on all slips.
9. If isolation of a wire was wiped, replace the sensor. Prevention 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. Various wear of slips cannot be the cause of claims. At a difference between thickness of the internal and external slip exceeding 2 mm it is necessary to check after all the directing support bolts for ease of the course and if necessary to replace them.

Installation

Prevention

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.

PERFORMANCE ORDER

1. Clear the directing surfaces, the place of landing of a slip 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. Before installation of slips feel a brake disk fingers regarding roughnesses, measure disk thickness.
	2. Check a boot (45) for cracks. Urgently replace the damaged boot since the getting dirt quickly puts a support out of action. The brake mechanism with a floating bracket at the same time has to be removed and disassembled in a specialized workshop.
	3. Besiege 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 the piston and not to damage the surface of pistons and boots.
Prevention 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 by means of a siphon.
4. Apply the plastic bottle used for storage only of 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. Prevention 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. When checking the second support has to be built. If through an oversight pistons jumped out or go hardly, it is necessary to remove a support and to collect it in a specialized workshop.
5. The following stage of works is not obligatory: to prevent a scratch of brakes, it is necessary to grease slightly the back and end faces of a basis of a slip (arrow) with lubricant means, for example, of Plastilube, Tunap VC 582/S, Chevron SRJ/2, Liqui Moly LM-36 or LM-508-ASC. Lubricant should not get on a slip or a brake disk at all. If necessary right there wipe lubricant paste, and clear a slip alcohol.
6. Insert both slips into a support. At the same time you watch that the spring bracket stood in parallel to the upper edge of a slip.
7. Put the wear sensor on an external slip.
8. Return the case of pistons to a starting position and screw on a guard new we samokontryashchitsya by a bolt with m 35 N.' moment. At the same time hold the directing bolt Rozhkov a key. Prevention Самоконтрящийся the fixing bolt can be applied only once.
9. Twirl a spiral wire of the sensor and connect in the shtekerny socket on a support. Close a plug cover.
10. Put forward wheels so that the marking put before their removal coincided. Take wheels. Lower the car, tighten wheel bolts in a crosswise order with m 110 N.' moment. Prevention Vigorously repeatedly press on a brake pedal, you will not feel strong resistance yet.
11. Check the level of brake fluid in a tank, if necessary add to the maximum mark.
12. 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. Prevention Prior to a run in 200 km avoid emergency brake application.
13. 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.