01-18-2018, 07:59 AM
You probably have a pair of quarter turn valves on a bulkhead just ahead of the rear axle. One valve shuts off supply to the leveling system, the other controls supply to all the other non-brake air uses. On my 93 coach the the dash "supply" gauge reports the pressure in the non-brake/non-suspension circuit, and a gauge near my rear 6-pack reports the pressue supplying the leveling system. Due to common sourcing both gauges read the same when both valves I just mentioned are open.
Closing these valves and monitoring the gauges will tell you where to search for leaks. If neither gauges drops quickly then you have a leak between the supply tank and the new check valves you just installed, or somewhere between the engine air compressor and the outlets from the "supply" tank.
Closing these valves and monitoring the gauges will tell you where to search for leaks. If neither gauges drops quickly then you have a leak between the supply tank and the new check valves you just installed, or somewhere between the engine air compressor and the outlets from the "supply" tank.
Jon Kabbe
1993 coach 337 with Civic towed