Pressure Retaining Valve
WARNING: This page is about a different car, the 2014 Volkswagen Touareg, 2013 Volkswagen Touareg, 2012 Volkswagen Touareg, and 2011 Volkswagen Touareg. However, it is still accessible from the selected car via links, so may be relevant.
The pressure retaining valve is maintenance-free and may only be replaced in the case of a noticeable leak.
The vehicle must be on a hoist to exchange the pressure retaining valve. The vehicle wheels must rotate freely.
NOTE:
The pressure retaining valve is open when the air line is screwed into the air spring shock absorber. If the air line is disconnected from the air spring shock absorber, the pressure retaining valve is closed.