The rear brakes are automatically adjusted, it is only necessary to check the thickness of the brake linings at prescribed intervals. Automatic adjustment is made by an expanding rod with a variable length. Namely, a spring-loaded wedge is located between the blocks and the expanding rod. After a single pressing of the brake medal, an air gap is established between the brake shoe and the drum. If the movement of the brake pad, due to wear of the lining, exceeds the set clearance. the wedge goes down, due to this the length of the expander rod increases, and the gap decreases. Brake fluid for the entire brake system and hydraulic clutch comes from the reservoir. which is located in front of the engine compartment. The pressure for both brake circuits is generated in the master brake cylinder by the brake pedal.
The hydraulic vacuum brake booster uses for its work a part of the reduced pressure generated by the engine. Motors 100 kW (136 HP) and diesel engines with a special vacuum pump that ensures the operation of the amplifier, and located on the cylinder head.
The hand brake acts on the brake pads of the rear wheels through a cable drive.
AUDI 80/90 uses Teves and Girling disc brake calipers. Work on replacing pads is carried out in different ways.
When cleaning the brake system, brake dust is released. This dust can lead to health problems. Therefore, when cleaning, make sure that brake dust is not inhaled.
Brake pads are an element "General Permit to Operate", besides, they differ depending on the model produced by the factory. Therefore, it is recommended to use VAG brake pads
Work on the brake system requires exceptional cleanliness and precision. In case of lack of experience, work should be carried out at a service station.
Note: On wet roads, apply the brakes from time to time to free the rims from foreign objects. While centrifugal force will shed water off the brake discs while driving, they still leave a thin film of silicones, rubber waste, grease and other contaminants that reduce braking performance.
After driving in the rain or winter, it is advisable to dry the brakes by gently pressing before stopping. It will also slow down the corrosion of the brake discs.
After installing new brake pads, they should run in. Unnecessary full braking during the first 200 km should be abandoned.
Rusted disc brakes create a grating effect when braking, which cannot be eliminated even with prolonged braking. In this case, the brake discs must be replaced.
Burnt dirt on the brake linings and clogged drain grooves lead to the formation of grooves on the brake disc. This leads to a decrease in the braking effect.
Caution: If the pedal travel changes after cornering, the brake disc must be checked for lateral play on the outer diameter. If necessary, the brake disc must be replaced.
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