Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ The description
+ Engines
+ System of release of the fulfilled gases
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and воздухозаборные channels
+ Injection system
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
- Brake system
   Check of brake mechanisms
   Brake liquid
   Check of level of a brake liquid
   Check of tightness of brake system
   Replacement of a brake liquid
   Disk brake mechanisms
   Measurement of a thickness колодок the disk mechanism
   The control of a condition of brake disks
   Replacement колодок disk brake mechanisms
   The drum-type brake mechanism
   Measurement brake колодок the drum-type mechanism
   Check of a course of a pedal of a brake
   The disk brake mechanism of back wheels
   Measurement of a thickness колодок back disk brakes
   Check of a free wheeling of the lever of a lay brake
   The main brake cylinder
   The amplifier of brakes
   Check of the amplifier of brakes
   Regulator of brake forces
   Repair of a hydraulic drive of brakes
   Prorolling of brake system
   The list of malfunctions
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
+ Ignition system
+ Illumination
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications


The control of a condition of brake disks

If for condition check колодок wheels simultaneously it is necessary to check up and a condition of brake disks are removed.


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

The 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
The minimum thickness
11 mm
20 mm
23 mm
8 mm