Service of Audi A4 from 2001 to 2005 release.
1. Operation and maintenance of the car
2. Engine
3. Transmission
3.1. Coupling
3.1.1. Check of functioning of the main and working cylinders of coupling
3.1.2. Removal of air from coupling knot
3.1.3. Removal and installation of the sensor on a coupling pedal
3.1.4. Removal and installation of a servopruzhina
3.1.5. Main cylinder of coupling
3.1.6. Removal and installation of the pipeline on the main thing / worker coupling cylinders
3.1.7. Instructions on removal and installation of the main thing / worker of cylinders of coupling
3.1.8. Removal and installation of the main cylinder
3.1.9. Coupling switching off mechanism
3.1.10. Removal and installation of the working cylinder
3.2. Mechanical transmission
3.3. Automatic transmission
3.4. Driving mechanism
3.5. Tables
4. Running gear
5. Steering mechanism
6. Brake system
7. Onboard electric equipment
8. Body
9. Schemes of electric equipment


3.1.1. Check of functioning of the main and working cylinders of coupling

Before replacement of the main / working cylinder in case of following malfunctions at first execute the corresponding checks.

Noise at coupling operation
At first check spring knot or the sensor of a pedal of coupling for existence of noise.
In the presence of noise – remove spring knot and repeat check.

Coupling pedal at installation it is necessary to lie on a floor (do not press a coupling pedal) or does not come back to a starting position
Check whether completely the pedal of coupling comes back to rest position, and whether, respectively, the air vent in the main cylinder is released.
Only if the air vent is not hammered – there is an independent constant removal of air from the hydraulic drive of coupling.
The jammed space covering for the legs / rugs blocking coupling pedal sensors, and also the malfunctions connected with long constant pressing a coupling pedal can wag considerably on ability of independent pumping of coupling.
Check all hydraulics for existence of internal leaks.
Check the level of brake fluid in a tank.
Visually check working and main cylinders, tubes and hoses with places of connections for existence of external leaks.
At detection of leaks replace the corresponding detail.
Remove air from coupling knot.

Big effort to pedals
Wear of a clutch plate (except SAC coupling).
Mechanical defect of a press disk / clutch plate.

Efforts to pedals
Standard coupling: (a new overlay of coupling) – about 115 N.
Overlay of coupling on limit of wear – about 160 N
SAC coupling: apprx. 140 N for all the time of work of coupling.
Coupling is not disconnected or disconnected by incompleteness
Air in hydraulic system. In this case pumping coupling / check of hydraulics on existence external and внутренниз leaks is necessary.

The heavy course of a clutch plate at gearing with a main shaft
Malfunction of the needle bearing in a flywheel (the aligning bearing of a main shaft). Replace the needle bearing.

Foreign matter in coupling
Mechanical defect of a press disk / clutch plate.
Perhaps at repair the wrong components are installed or some components are not installed (for example an intermediate guard).

3.1. Coupling

3.1.2. Removal of air from coupling knot