Air suspension

[iwander_85pt40]

Hi all,

Last weekend as we returned home from a short trip, the front air bags
deflated while on the freeway. It was easy to tell when I went over
the first bump. Luckily, we were within a couple of miles of home,
so I eased on in.

Here are the symptoms:

Front air bags deflated while cruising;
Air pressure--80 psi;
Brake pressure maintains at 70 psi;
Dumped the tag axle to back into parking spot--drive axle bags deflated;
My wife said she could hear an air leak as I was backing in;
By the time I finished backing in, set the brakes, and exited the
coach, the air pressure had dropped almost to zero, so I was unable to
pinpoint the leak.

I couldn't do anything about the issue during the week because of work.

Today, I started the coach up to build air pressure, and look for a
leak. Everything worked normally, although it took awhile for the
suspension to air up.

And, of course, there is no air leak to be heard. What else is new?

Anyway, the Ridewell manual points me to the suspension air filter
(possibly clogged) as causing slow air bag inflation and, of course,
an air leak in the lines/fittings, causing the suspension to drop.

However, I don't find anything that explains the deflation of the
front air bags, and subsequent deflation of the drive axle air bags
after I dumped the tag.

Because my wife heard an air leak, and because things seemed to be
somewhat normal today, I suspect a valve within the air suspension
system is malfunctioning.

Anybody experience the same issue? If so, what was the fix?

Anybody know where the suspension air filter is located? According to
the schematic, it appears to be between the rear air tanks.

Other suggestions are welcome.

TIA,

Phil
'iWander' 85PT40
Left Coast