Quote:
Originally Posted by werminghausen
I have spent 2 years rebuilding my axle valves and main valve myself and it is true: car will stay for months if your axle valves are good. Car won't drop nor would you loose air pressure in the tank. This is the ideal world. If your car drops in weeks time your axle valves leak for sure. Time to rebuild the air suspension. Don't even think about changing to steel springs.
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Unlike the 109, the 6.9s are hydraulic - not air. Different system - but the case is the same, if the system drops it's indicative of a leak. I would not worry about dropping over the course of two weeks, but if it drops in two days, I'd be working on it if it were my car.