Air spring is OK
WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.
- when the rubber boot cannot be pressed in by hand
- when no visible damage (e.g. kinks, cracks, porous areas, etc.) is discernible
- when the rolling fold is uniform
NOTE:
If one of the above-mentioned points fails the test, then the AIR SPRING must be replaced.