On coaches equipped with mechanical ride height valves, the typical setup is one valve on the front axle and two on the rear axle. The Valve is mounted to the frame and has a small bar connected to the suspension. When the suspension moves up and down the ride height valve's function is to add or dump air from the air bags such that proper ride height is maintained.
The single (1) front ride height valve controls coach “travel mode” leveling from front to back. The two (2) rear ride height valves control “travel mode” leveling from side to side. Rears are more important than front. The valve control rotates between add & dump, with center position being closed to keep air in air bags.
The air bags have a quarter inch plate on the top and bottom of each bag. Sort of like a Oreo cookie with the bag being the filling and the plates being the cookie on the top and bottom of the filling.
Place your motor home on as level a slab as you can.
To measure the ride height one must choose one of two measurements.
-OR-
Adjust the two rear height adjustments first. This should give them the correct height and the side to side measurement should be the same. Then adjust the single ride height for the front.
The OEM rubber covers for the ride height valves, deteriorate and fall off over time. Their purpose is to prevent dirt and contamination from entering the breather holes on the valves. They also provide some level of “muffler” to the outlet air. New covers are available for replacement, look for
If you find you have a leaking Ride Height Valve, you can use the following emergency procedure. Another Emergency Procedure If Your Ride Height Valve Fails
In order to get the coach back to ride height position it may be necessary to follow these steps.