Audi 80/Avant (B4)

Audi 80/Avant
The description
System of release of the fulfilled gases
Cooling system
Fuel tank and the fuel pump
The air filter and intake channels
Injection system
Transmission and transmission
Suspension bracket and steering
- Brake system
   Check of brake mechanisms
   Brake liquid
   Check of level of a brake liquid
   Check of tightness of brake system
   Replacement of a brake liquid
   Disk brake mechanisms
   Measurement of a thickness pads the disk mechanism
   The control of a condition of brake disks
   Replacement pads disk brake mechanisms
   The drum-type brake mechanism
   Measurement brake pads the drum-type mechanism
   Check of a course of a pedal of a brake
   The disk brake mechanism of back wheels
   Measurement of a thickness pads back disk brakes
   Check of a free wheeling of the lever of a lay brake
   The main brake cylinder
   The amplifier of brakes
   Check of the amplifier of brakes
   Regulator of brake forces
   Repair of a hydraulic drive of brakes
   Prorolling of brake system
   The list of malfunctions
Antiblocking system of brakes
Wheels and tyres
body electrosystem
Ignition system
Signalling devices
Devices and auxiliary devices
Heating and ventilation
Body elements
Search of malfunctions

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 search 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 an amplifier membrane.
  6. For the control of the return valve to disconnect a vacuum hose from the amplifier of brakes.
  7. The purge, but not всасывание should be possible.
  8. The return valve can be got only together with a 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 instrument panel (has undressed Salon).
  4. To remove шарнирный a finger in a head of a plug of draught of management of the amplifier of brakes.
  5. To turn out self-locking 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 its draught of management the removed condition:
  9. The distance between the middle of an aperture of a head of a plug and a basic surface with four hairpins should make 271 mm (the admission of 0,5 mm).
  10. After adjustment thoroughly to tighten a counternut.
  11. Before installation to grease шарнирный a bolt консистентной with greasing.
  12. To use only a new clamp for swivel a finger and new self-locking nuts. To establish a new sealing ring between the amplifier of a brake drive and the main brake cylinder.