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 the amplifier of brakes


  1. The engine should be muffled.
  2. To press a pedal of a brake of 10 times.
  3. To hold a brake pedal now completely squeezed out and to get the engine.
  4. At the serviceable amplifier of a brake drive the pedal should move a little during this moment. If it does not occur, means, strengthening of a brake drive is faulty.
  5. Most likely it is necessary to look for malfunction in vacuum system: not tight vacuum hose from an inlet collector to the amplifier of brakes, faulty the return valve in a vacuum hose near the amplifier, a rubber ring between the main brake cylinder and the amplifier or a membrane of the amplifier.
  6. For control of the return valve to disconnect a vacuum hose from the amplifier of brakes.
  7. The purge, but not absorption should be possible.
  8. The return valve can be got only together with the corresponding vacuum hose.
  9. For replacement of the damaged rubber ring between the main brake cylinder and the amplifier it is necessary to dismantle the cylinder.
  10. The faulty amplifier of brakes is not subject to repair. To replace.

Removal of the amplifier of a brake drive


  1. To remove the main brake cylinder.
  2. To remove a vacuum hose.
  3. To remove a shelf at the left under the dashboard (section Salon).
  4. To remove a sharnirny finger in a head of a fork of draft of management of the amplifier of brakes.
  5. To turn out самоконтрящиеся nuts, fastenings of the amplifier of brakes in car salon.
  6. Then to remove both nuts of fastening of the amplifier of brakes in a motor compartment.
  7. To remove the amplifier of brakes through a motor compartment.
  8. If the new amplifier is established, it is necessary to adjust length of his draft of management in the removed condition:
  9. The distance between the middle of an opening of a head of a fork and a basic surface with four hairpins should make 271 mm (the admission of 0,5 mm).
  10. After adjustment thoroughly to tighten a lock-nut.
  11. Before installation to grease a sharnirny bolt with konsistentny greasing.
  12. To use only a new clamp for a sharnirny finger and new самоконтрящиеся nuts. To establish a new sealing ring between the amplifier of a brake drive and the main brake cylinder.