-Never lower vehicle with air Discharged from air-suspension bellows!
-Pressurize air spring to 5bar (72PSI).
-Check air suspension system for leaks.
-Lower vehicle with pressurized air spring modules from the lifting platform.
Verify after repair if the system is completely sealed.
The easiest way this is by parking the vehicle determine. Wait for the automatic readjustment of the system, if your vehicle has this feature. All heights the air are supported accurately measure from the ground to the lower edge of fenders and note. The next day, check and compare these heights.
Even a small deviation of the distances leads to permanent damage to the compressor and the valves.