Check the single front ride height valve for leaks. It is located high
under coach between front tires. Valve is mounted to frame and has a small
bar connected to suspension. When suspension moves up and down the ride
height valve's function is to add or dump air from all four front air bags.
The valve control only rotates a small amount between add & dump, with
center being the place that valve is supposed to be closed to keep air in
Most ride height valves have a bottom dump muffler/filter and a rubber 'hat'
cover to keep filter material inside the dump part of the valve. Meritor
valves have a poorly compounded rubber hat that often disintegrates and
falls off letting muffler filter material fall out. This may not be a
problem, except dirt and water may now be able to get into valve. The front
valve is so high up in a protected area under the coach, if the filter falls
out, it may be OK for a while.
Many have made their own valve bottom protector with a vinyl hose extension held in place with a hose clamp as rubber hat is not a replaceable item and
it is a waste to replace valve just to get a new hat, as the new hat may
When valve leaks the air bags will leak down. When ignition key is on and
HWH is in travel mode, the top two solenoids on the HWH 6-pack manifold are
open, to allow coach's ride height valve to control leveling. When front
air bags are manually raised with HWH panel and then HWH power is removed,
the top two solenoids remain closed and keep the ride height valve from
managing the leveling. This also keeps the rear ride height leveling system
from functioning. Another way is to remove the front ride height mechanical
linkage and find the sweet spot on the ride height valve that does not leak
any air, then tape it in that position. Another way to disable the
solenoids is to pull specific fuses within the HWH control box.
Since your travel mode light goes out, this could indicate a different
problem, but It sounds like your ride height valve could be leaking.
One can drive for days and weeks with front ride height valve out of the
picture, until a replacement ride height valve is found.
Single front ride height valve controls coach driving leveling from front to
back. Two rear ride height valves control driving leveling from side to
side. Rears are more important than front.
The Front air regulator supplies air from the front brake tank to the front air suspension manifold. Pressure should be 50-60 lbs.
They put a regulator in the front circuit so that when we go into travel mode, the front end
(which is lighter) doesn't raise faster than the rear and confuse us into thinking we're ready to travel before the rear is at travel height!