Rear Suspension

Air Suspension Strut, Filling

Special tools, testers and auxiliary items required

• Adapter (T10157/1)

• Air Suspension Strut Charger (VAS 6231)

• Steel gas bottle filled with argon or corgon

• Suspension struts (air suspension) are delivered as a replacement part with a minimum pressure. By sitting in storage for extended periods this pressure can diminish (just like a tire). Before the suspension strut (air suspension) is removed from its packaging, this minimum pressure must be controlled by refilling. If the suspension strut (air suspension) is removed from its packaging without this control/refilling, folds can occur in the under-filled air spring boot. These indentations lead to preliminary damage and may lead to premature failure.

- Remove the cover from the packaging.

- Remove the union bolt - arrow - from the residual pressure holding valve. Illustration shows front suspension strut (air suspension).






- Close the valve of the steel gas bottle.

- Become familiar with the relevant rules for the prevention of accidents for pressurized containers and technical gases.

- Connect (VAS 6231) and (T10157/1) as shown in illustration.






1. Suspension strut (air suspension) in packaging

2. Steel gas bottle for argon, corgon with gauges

3. Air Suspension Strut Charger (VAS 6231)

4. Adapter (T10157/1)


• Refilling the suspension strut (air suspension) may only be performed with the gases from the top to prevent any "uncleaned" air from getting into the air suspension system.

- Set flow rate limiter gauge to 2.0 liters/min - arrow -.






- Now fill gas in suspension strut (air suspension) with several individual pressure bursts.

The display only shows a correct pressure if the back pressure of the residual pressure retaining valve is overcome. The back pressure is at approximately 3.5 bar. The air suspension strut is filled with enough gas when the pressure reaches 3.5 to 4.5 bar.






- Make sure pressure does not exceed 4.5 bar when filling.

- Disconnect (VAS 6231) from (T10157/1). Gas escapes at pressure above 3.5 bar.

Minimum pressure is now reestablished. Suspension strut (air suspension) can be removed from packaging.

- After installation, first drive the vehicle at high ride height and then at normal ride height. Repeat this sequence once more.

By moving the vehicle lever heights twice, the majority of the gas is exchanged with filtered air from the air supply motor.

- Suspension strut (air suspension), installing. Refer to => [ Air Suspension Strut ] Air Suspension Strut.