Clutch Hydraulic System: Service and Repair

Clutch System, Bleeding

• After working on the hydraulic clutch mechanism, the system must be bled.

• During the following procedures, make sure that brake fluid does not leak onto the longitudinal member or the transmission.

• Before bleeding, fill the brake fluid reservoir to the "max" marking with brake fluid.

Special tools, testers and auxiliary items required

• Brake Filler/Bleeder Unit (VAS 5234)

Brake fluid specification.

Procedure

• Tightening specification, refer to => [ Hydraulics Overview ] Hydraulics Overview.

Vehicles with an Air Filter Housing in Front of the Battery

- Remove the entire air filter housing.






Continued for All Vehicles

- Pull the clutch pedal back to the rest position.

- Connect the (VAS 5234) to brake fluid reservoir.

- Remove the cap from the bleeder valve - arrow - and connect bleeder bottle hose - A -.






- Switch on brake filler/bleeder unit.

• Working pressure 2.0 bar positive pressure.

- Open the bleeder valve approximately one 1/4 and drain 100 cm3 of brake fluid.

- With bleeder valve open, with your hand, push the clutch pedal very quickly 15 to 20 times from one stop to the other (approximately 2 presses per second).

- Closes the bleeder valve.

- Switch off the (VAS 5234) and reduce 2 bar working pressure.

- Slowly press clutch pedal 10 times using your foot and check the clutch system function.

- Disconnect the (VAS 5234) from the brake fluid reservoir.

- Install the air filter housing.