Joe: on the other board at top in the articles section is a complete tutorial on the level low system unique to prevost. Prob in one of your norgen valves. Might cure it's self but you need to watch it very good . Bob. Everyone else welcome to watch it at prevostcommunity.com very educational on air leveling systems.
I had a leaking leveling valve on the rear of the side that was low - there are three leveling valves on the bus, two in the rear and one in the front. There should be no air leaking out from the exhaust when the bus is level and turned off. That's the simple one. The level low system uses a number of Norgren valves to control the height of the bus. There is a manifold in the compartment below the driver - another easy place to look for leaks. I second the tutorial - very helpful.Steve
Are you sure it is a low level system or a HWH leveling system either way start at the manifold and the electric control valves plenty of places there for leaks have fun It has to be a leak after the protection valve it closes at 70 lbs and will not let air into the suspension system that is why they drop The bus setting for those years check the plastic lines the Texas rats love that stuff so do welding sparks and grinder sparks