Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car

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
+ System of injection
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
- Brake system
   Check of brake mechanisms
   Brake fluid
   Check of level of brake fluid
   Check of tightness of brake system
   Replacement of brake fluid
   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 brake mechanism
   Measurement of brake shoes of the drum mechanism
   Check of the 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 the hydraulic drive of brakes
   Pumping of brake system
   List of malfunctions
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Repair of the hydraulic drive of brakes

If the pipeline of the brake drive (1) and brake hoses (4) with stamped fixture (3) are connected with elements of a running gear or a body, there should be no springing holder of a hose (2). On an illustration connection is weakened by Rozhkov a wrench of 14 mm and a key for the brake pipeline (above).


  • Brake fluid is poisonous. Therefore it should not get to a mouth.
  • Brake fluid is aggressive in relation to a body covering. Therefore it is impossible to put the rags or tools stained with brake fluid impregnated with brake fluid on body details.
  • At removal of a brake hose or the brake pipeline brake fluid gradually follows from a receiver. You can prevent it as follows: before removal of bolted connections weaken the pumping valve in the corresponding contour.
  • Put on it a hose and send it to any capacity. Now completely squeeze out a pedal of a brake and record a suitable plate in this situation. Thus drain openings in the main brake cylinder will be closed – brake fluid does not follow any more.
  • For removal and installation of the brake pipeline you need to get the key specified illustrations below for the brake pipeline. Also for a priderzhivaniye of brake hoses you will need a rozhkovy wrench of 14 mm.
  • After repair of a hydraulic system of brakes it needs to be pumped over. Often happens to pump over enough only that brake contour in which works were carried out.

Removal of the pipeline of the brake drive


  1. To turn out the union of the brake pipeline. For this purpose it is necessary to hold an opposite nut of connection – for example, at a brake hose.
  2. If the nut prirzhavet to a tube because of what it rotates together with a nut, it is necessary to replace this tube. Thin-walled tubes quickly break.
  3. If the corresponding piece of a tube has to be replaced, for weakening of connections of the pipeline it is possible to use the following reception:
  4. To saw off the brake pipeline near bolted connection, to turn off a cap nut a six-sided head.
  5. To insert the brake pipeline in holders.
  6. To pump over brake system.

Removal of brake hoses


  1. At first to unscrew the union of the corresponding brake pipeline. Thus to watch that the pipeline was not overwound.
  2. If the brake hose is fixed on a body by means of the stamped holder, it is protected by a sheet bracket from slipping. At assembly it is necessary to establish this so-called holder of a hose.
  3. At installation of a hose it should be twisted at first on that end which has an external carving.
  4. Then to tighten other carving.
  5. The brake hose should not be overwound. For control the color strip or a rubber side serves.
  6. To pump over brake system.
  7. Right after repair to check, whether the hose rubs somewhere at the springing movements.
  8. To repeat action after rather long trip.