Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
- Brake system
   Check of brake mechanisms
   Brake liquid
   Check of level of brake liquid
   Check of tightness of brake system
   Replacement of brake liquid
   Disk brake mechanisms
   Measurement of thickness of blocks of the disk mechanism
   Control of a condition of brake disks
   Replacement of blocks of disk brake mechanisms
   Drum-type brake mechanism
   Measurement of brake shoes of the drum-type mechanism
   Check of a course of a pedal of a brake
   Disk brake mechanism of back wheels
   Measurement of thickness of blocks of back disk brakes
   Check of a free wheeling of the lever of the parking brake
   Main brake cylinder
   Amplifier of brakes
   Check of the amplifier of brakes
   Regulator of brake forces
   Repair of a hydraulic drive of brakes
   Pumping of brake system
   List of malfunctions
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Check of tightness of brake system

For monitoring procedure the lower part of a body should be dry that you could make out not tight places. Brake liquid gets and under dirt. Dark places from moisture force to assume leak.


  1. Check all places of connections, and also supports of the disk brake mechanism and guards of the drum-type brake mechanism behind which wheel brake cylinders are located.
  2. Hoses of brake system should not be damp, swelled or rubbed. Otherwise it is necessary to replace them.
  3. Pipelines of brake system have a corrosion-resistant coating. If to damage this protective layer, formation of a rust can begin. Therefore never it is impossible to clean serviceable pipelines of brake system by means of a screw-driver, a nazhdachny skin or a wire brush.
  4. If the protective layer is damaged, it is necessary to put with a thin layer an anticorrosion first coat.
  5. With traces of a rust or squeezed it is necessary to replace tubes.
  6. Whether
  7. all valves of pumping are protected by protective caps? They are on supports of disk brake mechanisms or in guards of drum-type brake mechanisms.
  8. You can check improvised pressure in brake system:
  9. Squeeze out a brake pedal with full force.
  10. It should not give in and after several minutes of full loading, one of cuffs of the main brake cylinder otherwise is defective.
  11. Because of not tight cuff liquid level in a tank does not go down, however squeezed liquid flows via the piston in the main brake cylinder on other party where pressure is absent.
  12. Not tight places on cuffs of pistons of supports of disk brake mechanisms and brake cylinders of drum-type mechanisms can be distinguished in dark places on supports disk or guards of drum-type brake mechanisms.
  13. If you are not sure – address in a workshop.