Audi A4, S4

since 2000 of release

Repair and car operation

Audi A4, S4
+ Introduction
+ Governing bodies and receptions of safe operation
+ Current leaving and service
+ Engine
+ Systems of cooling, 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
   - Coupling
      General information
      Removal, installation and coupling check
      Removal and bearing installation
      Air removal 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


Air removal 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 pedal of coupling does not come back back or comes back with delay or the hydrosystem was opened.

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

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

Do not allow hit of brake liquid on a check point If it occurred, immediately wipe liquid. Hit of 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 carrying out operation familiarize with Poddomkrachivaniye's Section and towage.


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

Air removal by means of the special device

On HUNDRED air from hydrosystem is removed, as a rule, by means of the device. Such device creates pressure (Max. 2.5 atm.) in the tank for liquid.


    Unscrew screws and uncover the tank of brake liquid. Fill the tank with liquid to MAX mark. Attach the device for air removal according to its management, yet including it. Open the ventilation valve before turning on the device. Before removal of air extend a coupling pedal.
    On the working cylinder of coupling put on a hose (And) on the ventilation union (the shooter on an accompanying illustration), the union is open. Connect a ventilation hose to a capacity hose for brake liquid.
    Turn on the device and let out about 100 cm of the 3rd brake liquid. It corresponds to volume of a tea cup. At the end of removal procedure air from should not contain bubbles. Tighten the union the moment 4.5Нм. Several times press a coupling pedal. Fill the tank with liquid to MAX mark. Screw on the tank a cover. If necessary, repeat process of removal of air. Establish into place the bottom cover of a check point if she acted in film.

Air removal without use of special devices


    Check level of brake liquid in the general tank, if necessary, add liquid to MAX mark. Remove boots from the union of removal of air on the working cylinder and from a support of a forward left wheel. Carefully open and close unions for air removal. Put on the support union a transparent hose. Fill a hose with brake liquid. For this purpose open the union on a support. Ask the assistant to press slowly a pedal of a brake and to keep it in this situation. 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 brake liquid. Close a hose a finger that liquid did not follow.

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

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

At the process described above in hydrosystem there can be an 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.