Audi 80/Avant (B4)

Audi 80/Avant
The description
System of release of the fulfilled gases
Cooling system
Fuel tank and the fuel pump
The air filter and intake channels
Injection system
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 pads the disk mechanism
   The control of a condition of brake disks
   Replacement pads disk brake mechanisms
   The drum-type brake mechanism
   Measurement brake pads 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 pads 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
body electrosystem
Ignition system
Signalling devices
Devices and auxiliary devices
Heating and ventilation
Body elements
Search of malfunctions

The main brake cylinder

The main brake cylinder is some kind of "chief" in brake system. It is located behind at the left in a motor compartment and gives to supports of brake mechanisms or wheel brake cylinders "order" on braking. In more details about its design and functioning it is written in the beginning of this chapter.

Removal of the main brake cylinder


  1. To pump out a brake liquid from a compensatory tank.
  2. To remove a tank from the main brake cylinder.
  3. To disconnect all brake hoses of the main brake cylinder.
  4. To turn out both fixing bolts of the bottom fastening of the main brake cylinder.
  5. At assemblage to establish a new sealing ring between the amplifier of a brake drive and the main brake cylinder.
  6. To tighten a fixing nut the moment 25 Nm.
  7. Before to establish a tank, it is necessary to moisten from within with a brake liquid a sealing stopper of the connecting union of a compensatory tank.
  8. To remove air from brake system.