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

Control of a condition of brake disks

If for check of a condition of blocks wheels are removed, at the same time it is necessary to check and a condition of brake disks.


  1. On disks there should be no deep grooves (appeared as a result of influence of dirt or strongly worn-out blocks). Otherwise these grooves deeply врежутся in new brake shoes that will essentially reduce term of their service and, besides, will be lowered by brake influence.
  2. The brake disks damaged by furrows can be processed on the lathe, in case they not истончились as a result of long service life till the minimum size (look the table below).
  3. It is necessary to replace too thin disks in pairs.
  4. The bluish shade of brake disks has no value.

Sizes of brake disks

Brake disks
lobbies not ventilated
lobbies ventilated (the one-piston brake mechanism)
lobbies ventilated (the two-piston brake mechanism)
the back
Thickness of new disks
13 mm
22 mm
25 mm
10 mm
Minimum thickness
11 mm
20 mm
23 mm
8 mm