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03-11-2008, 09:35

Is there an easy way to test the air compressor on my coach? The coach
just doesn't air up like it should - seems to take forever, even at a
high idle it does not build and maintain air pressure very well. Once
on the road, actually driving, everything is fine. Pressure builds
rapidly and stays. But moving through parking lots at low speed gets
interesting as air pressure drops dramatically with each press of the
brakes and does not build back up for a considerable length of time.

I know something has gone wrong because I didn't have this problem
when I bought the coach. While I still have a couple of tiny air
leaks, they are very minor. I aired the coach up with my shop air
compressor and listened for leaks, I've found two small leaks in the
engine compartment that I'm working on but there's no way they are
venting enough air to cause this. The coach does air down fairly
rapidly after stopping, though. Suspension stays aired up but the
step, for instance, will give up and come out within 5 to 10 minutes
of turning the engine off (even if not used).

I have an appointment to have it looked at by a local shop on Friday
but was hoping to get a head start, maybe save myself some labor
charges.

-Ryan
'86 PT-40 8V92