Audi A4, S4

since 2000 release

Repair and operation of the car


Audi A4, S4
+ Introduction
+ Governing bodies and methods of safe operation
+ Current leaving and service
+ Engine
+ Cooling systems, heating and air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling, power shafts and differential
- Brake system
   Specifications
   Removal of air from brake system
   Removal and installation of front brake shoes
   Removal and installation of blocks of brake mechanisms of back wheels
   Check of thickness of a brake disk
   Removal and installation of a brake disk / support
   Adjustment of the parking brake
   Removal and installation of the switch of a stoplight
   Removal and installation of a brake hose
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment





Removal of air from brake system

After carrying out repair of brake system during which its opening was made, air can get to system. In this case air needs to be removed from system. A sign of existence in pipelines of system of air is the brake pedal pliability when pressing it. In this case it is necessary to eliminate leakage and to remove air from system.

On HUNDRED brake system it is, as a rule, filled with liquid, and air from it is removed by means of the special device.

When using of the specified adaptation pressure of filling of system should not exceed 1 atm. This operation can be performed as well without the specified device. In this case air from brake system is removed by kachatelny movements of a pedal of a brake what requires the help of the assistant.

If air got into any separate brake cylinder, it is necessary to delete air from all brake system and by that from each wheel cylinder. If only one support, as a rule, is replaced or under repair it is sufficient to remove air from the corresponding brake cylinder.

The remark on security measures

If one of chambers of the tank of brake fluid is completely emptied (for example, with leakage in brake system or if during removal of air forgot to add liquid in the tank), in system air which gets to the pump ABS is sucked in. Air from brake system in this case has to be removed on HUNDRED with use of the special device.

Sequence of removal of air: back right brake, back left brake, forward right and forward left brake and working cylinder of coupling.