Notes On Repairing Air-Spring Struts
WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
Information
As of a mileage of 200, 000 Km it is recommended that the air springs be replaced per axle if there is damage to one air spring.
If the shock absorbers leak, the complete air spring strut is to be replaced. The oil of the shock absorber can damage the roller.
When depressurised, the air spring must not be twisted. There is the danger that the roller in the inside of the air spring will be damaged by bending or folding and thus significantly reduce the running time.