[Neweller]

If your coach has the MAC valves (6 in front & 6 in back) as a part of the leveling system air can leak out the top of the valve around the manual operate (push & lock) plunger. Or a valve might not close all the way due to a broken manual operate shaft (I had one) or grit inside the solenoid might prevent it from fully retracting (I also found grit in several valves in the engine compartment). I rebuilt all my leaking valves with a rebuild kits available from MAC distributors at about $12.50 each. Most valves can be rebuilt without taking them out of the vehicle, just loosen them from their mounting. On some I had to remove one air hose to get access to the valve. Or MAC will rebuild your valves for about half the price of a new valve. I bought one new valve ($45.00) so I could take it apart and study the inside. I suppose a leaking ride height valve could cause air to leave one (or more) air bags.