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 the 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 the brake system
   List of malfunctions
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signaling 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).

Sleva: the 5-cylinder engine is supplied with the additional vacuum pump (2) which is in addition strengthening the lowered pressure in a 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 discharge was not lost, before a branch to the pump the backpressure valve (3) is installed.

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 course before the back bridge on the right. It can reduce liquid pressure in back wheel cylinders.

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

The regulator of brake forces receives through the 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 the regulator of brake forces

For bystry 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 take away a leg.
  2. At the same time the lever of the regulator of brake forces has to 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 the fact that it does not allow the brake pressure of the back bridge to enter a dangerous zone at all.