Disc brakes are cooled by counter air flow. Additional cooling is provided by the brake discs of the front mechanisms of vehicles with an engine of 85 kW or more. The same applies to models with a 66 kW engine with automatic transmission. This additional cooling is carried out through special large holes through which the air flow passes.
On AUDI 80 cars, the front wheels, and for some models the rear wheels, are equipped with disc brakes with a so-called floating caliper, consisting of a caliper and a wheel cylinder. This brace is shaped like a clenched fist. The piston in the wheel cylinder housing presses the inner brake pad against the brake disc. In this case, the body of the brake cylinder itself is displaced in the guide sleeve and presses the outer brake pad against the brake disc.
Moisture on the brake discs when driving on wet roads in rain or snow slows down the brakes for a few fractions of a second. This time is needed to remove moisture from the brake disc by evaporating it. This effect is exacerbated in winter, because the salt that is sprinkled on the roads during this period of time settles on the brake discs and pads.
Brake pads front disc brakes
The brake pads of the front disc brakes are usually enough for a run of 50,000 km. However, we recommend that you do not neglect the regular visual inspection of their condition. The permissible residual thickness of the brake linings is 2 mm. The thickness of the metal plate on which the overlay is attached is not taken into account. This plate is about 5 mm thick. Visual inspection of the thickness of the pads is carried out with the wheel cover removed.
1. Light the brake pads with a flashlight through the hole in the rim and evaluate the condition and thickness of the brake pads. More accurate is the control of the brake pads on the removed wheels.
2. Measure the thickness of the inner and outer brake pads with a ruler (see illustration).
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