Front Suspension

Pressure-Holding Valve

Special tools, testers and auxiliary items required

• Torque Wrench (V.A.G 1331)

• Vehicle Diagnostic Tester (VAS 5051B)

• The pressure-holding valve is maintenance-free and may only be replaced in the case of a noticeable leak.

• With the air spring shock absorber removed, no additional preparation is needed for replacing the pressure-holding valve.

• The vehicle must be on a lifting platform to replace the pressure-holding valve. The vehicle wheels must rotate freely.

• When removing the air line, there is the possibility that the pressure-holding valve will also be removed.

• If the vehicle is not raised with a lifting platform, the vehicle sinks immediately on the side on which the pressure-holding valve is removed. There is a strong risk of injury because the arms can be clamped.

• The vehicle must remain on the lifting platform until a new pressure-holding valve is installed and the air spring shock absorber is refilled.

Removing

• This procedure applies to the replacement of a pressure-holding valve with the air spring shock absorber installed.

- Activate vehicle lift mode. Refer to => [ Vehicle Lift Mode ] Description and Operation.

- Position the vehicle on the lifting platform and raise it until the wheels rotate freely.

- Bleed the air spring shock absorber with the (VAS 5051B).

- Clean the pressure-holding valve area.

- Unscrew the air line from the pressure-holding valve - 1 -.






- Remove the pressure-holding valve from the air spring shock absorber.

Installing

Install in reverse order of removal. Note the following:

The air line has 2 markings.






Insert the air line until the front marking - arrow A - is completely covered by the union nut.

Only the second marking - arrow B - may still be visible on the air line.

- Fill the air spring shock absorber using the (VAS 5051).

Tightening Specifications