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 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


    To pump out a brake liquid from a compensatory tank. To remove a tank from the main brake cylinder. To disconnect all brake hoses of the main brake cylinder. To turn out both fixing bolts of the bottom fastening of the main brake cylinder. At assemblage to establish a new sealing ring between the amplifier of a brake drive and the main brake cylinder. To tighten a fixing nut the moment 25 Н•м. 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. To remove air from brake system.