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

Measurement of brake shoes of the drum mechanism

The viewing opening for control of thickness of overlays of the back drum brake mechanism is located in a guard of the drum brake mechanism in front in the direction of the movement. At uncovered are visible a brake shoe (1) with the frictional brake slip pasted on it (2). The brake drum (3) is also visible.

As the active block wears out quicker back passive, thickness should be measured on a forward block.


  1. To lift the car behind.
  2. To remove a plastic cap on inside of the corresponding wheel in front on a guard of the drum brake mechanism.
  3. To light a pocket small lamp in a viewing opening, to establish block thickness.
  4. Wear of blocks is admissible to 2,5 mm of residual thickness – without carrier thickness. Otherwise they need to be changed.