Audi A4

Since 1994 of release

Repair and car operation

Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
- Brakes
   Independent work on brake system
   So the brake system works
   Check of brakes
   Brake liquid
   Check of level of a brake liquid
   Check of brake system on tightness and presence of damages
   Replacement of a brake liquid
   Disk brakes
   Measurement of a thickness of overlays of forward disk brakes
   Check of a condition of brake disks
   Replacement of overlays of disk brakes
   Back disk brakes
   Measurement of overlays of back disk brakes
   Manual brake
   Check of idling of the lever of a manual brake
   The main brake cylinder
   The brake amplifier
   Check of the brake amplifier
   Works on hydraulics of brake system
   Prorolling of brake system
   The help at malfunctions
   ABS and EDS
   What does ABS?
   Function of separate knots
   Electronic system of distribution of brake effort (EBV)
   Infringements in system ABS work
   Electronic blocking of differential (EDS)
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics

The main brake cylinder

Adjustment of a manual brake

Details of an adjusting element

And – exact adjustment;
In – rough adjustment;

With – an adjusting nut;
D – a fixing collar.

The adjusting mechanism (1) with a fixing collar (2) is in covers of cables of a manual brake in front of the back bridge.

The main brake cylinder in certain degree is a basic element in brake system. It settles down behind at the left in an impellent compartment and gives to brake supports a signal to begin braking. Concerning its device and functioning you will find more detailed information in the beginning of this chapter.

Dismantle of the main brake cylinder


  1. Suck away a brake liquid from a tank, for this purpose take out a strainer from a jellied branch pipe.
  2. Disconnect from a tank a socket of the alarm indicator of level of a brake liquid, the same concerns wires of the cylinder of coupling.
  3. Take out a tank from the main brake cylinder.
  4. Dismantle a vacuum hose of the brake amplifier.
  5. Mark brake hoses on the main brake cylinder for the subsequent installation and unscrew them.
  6. Unscrew both fixing nuts (not bolts TORX) behind on the main brake cylinder.
  7. Cautiously and without bending, take out the main brake cylinder from the brake amplifier.
  8. At assemblage put a new sealing ring between the brake amplifier and the main brake cylinder.
  9. Cautiously put the main brake cylinder on the brake amplifier. If it is necessary, let the assistant will cautiously press a brake pedal that it was easier to pull the main brake cylinder on press a rod.
  10. Tighten fixing nuts on 50 Nanometers.
  11. Tighten brake hoses on 15 Nanometers.
  12. Before the broad tank will be pressed, moisten from within with a brake liquid a sealing stopper of a connecting branch pipe of a broad tank.
  13. Pump over brake system.
  14. If it is necessary, pump over hydraulic system of coupling.