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

Regulator of brake forces

The regulator of brake forces (1) for the back bridge of front-wheel models is connected with the back bridge a spring (2) and the driving lever (3).

At the left: the 5-cylinder engine is supplied with the additional vacuum pump (2) which is in addition strengthening lowered pressure in the hose from an inlet collector (1). Thus in a hose (4) in front of the pump to the amplifier (5) enough force for operation of brakes is provided. In order that the razryazheniye was not lost, before branch to the pump the return valve (3) is established.

On the right: here the vacuum pump is shown once again at a short distance. Figures correspond to the left illustration.

At front-wheel Audi 80 versions the regulator of brake forces is located at the left arm of the bearing on the right on a course before the back bridge. It can reduce pressure of liquid in back wheel cylinders.

It occurs depending on loading: at completely loaded car the back part of a body falls at small loading if in the car one sit or two person, the deflection of back springs is insignificant. Because of excessive pressure upon back wheels they are prematurely blocked, and the car when braking can develop across.

The regulator of brake forces receives through a spring connected with the back bridge, information on a condition of loading of the car – depending on that, the back bridge how low fell.

Check of a regulator of brake forces

For fast check of action you will need the assistant. The car should not be raised a jack.


  1. Sharply squeeze out up to the end a pedal of a brake and quickly clean a foot.
  2. Thus the lever of a regulator of brake forces should move.

Regulator of brake forces of all-wheel drive models

At the all-wheel drive Audi 80 models the regulator of brake forces is located ahead near the ABS block in a motor compartment. It simpler design. Blocking of back wheels prevents this regulator that he at all does not allow brake pressure of the back bridge to enter into a dangerous zone.