Testing compressor?

[ronmarabito2002]

Most likely it is a bad regulator, but could be a leak in the brake
system which you can't detect unless you are applying the brakes.

R.E. (Ron) Marabito, Dallas, TX 92WB40

--- In WanderlodgeForum@yahoogroups.com, "Ryan Wright"
wrote:
>
> 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
>