Audi A4, S4

Since 2000 of release

Repair and car operation

Audi A4, S4
+ Introduction
+ Controls and receptions of safe operation
+ Current leaving and service
+ The engine
+ Systems of cooling, heating and the air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Systems of an electric equipment of the engine
+ Manual box of a gear change
+ Automatic transmission
- Coupling, power shafts and differential
   - Coupling
      The general data
      Removal, installation and coupling check
      Removal and bearing installation
      Removal of air from hydrosystem of a drive of coupling
   + Power shafts of wheels
   + Models with a full drive of wheels
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Removal of air from hydrosystem of a drive of coupling

Air should be removed from hydrosystem of a drive of coupling, if at inclusion of any transfer coupling is badly switched off, the coupling pedal does not come back back or comes back with delay or the hydrosystem was opened.

As the coupling hydrosystem works on a brake liquid, it is necessary to observe the instructions resulted in Section Removal of air from brake system.

The brake liquid is poisonous. At all do not suck away her mouth through a hose. Store a brake liquid only in capacities casual access to which is excluded.

Do not suppose hit of a brake liquid on a check point If it has occurred, immediately wipe a liquid. Hit of a brake liquid on a check point from a magnesian alloy is especially dangerous.

Operation of lifting and car installation on supports is connected with danger! Therefore before operation carrying out familiarise with Razdelom Poddomkrachivanie and towage.


  1. Lift and establish the car on supports and remove the bottom cover if it is available.

Removal of air by means of the special device

On HUNDRED air from hydrosystem leaves, as a rule, by means of the device. Such device creates pressure (макс. 2.5 атм.) in the tank for a liquid.


  1. Turn away screws and uncover the tank of a brake liquid. Fill the tank with a liquid to mark MAX.
  2. Attach the device for air removal according to its management, yet without including it.
  3. Open the ventilation valve before including the device.
  4. Before air removal extend a coupling pedal.
  1. On the working cylinder of coupling put on a hose () the ventilation union (the marksman on an accompanying illustration), the union is opened. Connect a hose of ventilation to a hose of capacity for a brake liquid.
  1. Include the device and let out about 100 sm 3 brake liquids. It corresponds to volume of a tea cup. In the end of procedure of removal air from should not contain bubbles. Tighten the union the moment 4.5Нм.
  2. Some times press a coupling pedal.
  3. Fill the tank with a liquid to mark MAX. Screw on the tank a cover.
  4. If necessary, repeat process of removal of air.
  5. Establish into place the bottom cover of a check point if she acted in film.

Removal of air without application of special devices


  1. Check up level of a brake liquid in the general tank, if necessary, add a liquid to mark MAX.
  2. Remove dusterи from the union of removal of air on the working cylinder and from a support of a forward left wheel.
  3. Cautiously open and close unions for air removal.
  4. Put on the support union a transparent hose.
  5. Fill a hose with a brake liquid. For this purpose open the union on a support. Ask the assistant to press slowly a pedal of a brake and to hold it in this position. Close the union and release a pedal. Then again open the union and again press a pedal. Repeat process until the hose will not be filled with a brake liquid. Close a hose a finger that the liquid did not follow.

Liquid level in the tank should not fall too low, if necessary add a liquid.

  1. Put on the free end of a hose the union for removal of air of the working cylinder of coupling and open both unions.
  2. Press a brake pedal, close the union on a support and release a pedal. Repeat this process so much time, how many it is necessary that in the tank the liquid with bubbles did not arrive. Thus constantly add a liquid.
  3. Close unions on a support and the working cylinder of coupling. Remove a hose and put on dusterи.
  4. Lower the car on wheels.
  5. Fill the tank with a brake liquid to mark MAX.
  6. Some times press a brake pedal. Thereby removal of the rests of air in system in the tank of a brake liquid is provided.
  7. Check up work of brake system and coupling.

At the process described above in hydrosystem there can be air quantity. A sign of it is the gnash at inclusion of transfer and indistinct separation of coupling. In this case immediately remove air by means of the device on HUNDRED.