Porsche Cayenne 958 — 2015
An illustrative example of a case we see regularly — details vary from car to car.
The whole front axle dropping overnight, but rising normally at start-up.
A whole axle rather than one corner points to the valve block, not the springs. Pressure testing confirmed an internal block leak. The air springs were sound.
Removed the valve block, fitted an internal seal kit, refitted and full pressure test, cleared codes and recalibrated.
The car held height across three nights of testing. A seal kit cost a fraction of a new valve block. Turnaround: one day.
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