Leaking air when braking

[Leroy Eckert]

I'm just guessing and telling you what I would do, and I am not totally familiar
with the system.

Based on the symptoms, logically it does not appear anything let go downstream
of an air control valve because it is now normal.

My guess is that some foreign material may have gotten into an air control valve
and was subsequently expelled overboard when the brakes were released. My air
drawings are at the bus or I could look to see how the air flows and exits the
system. To my thinking, and sometimes that is radical, the symptoms indicate an
air control valve or beyond.

I would not do anything now, and that is easy to say because it is not my bus.
You could go on a wild goose chase trying to find out what happened.

Just my logical guess. If you have an air system drawing you should be able to
see how the air gets around. If not, I have one for my 1990 and can supply it
to you later in the week.

Leroy Eckert
1990 WB-40"Smoke N Mirrors"
Niceville, FL



----- Original Message -----
From: Kevin McKeown
To: WanderlodgeForum@yahoogroups.com
Sent: Monday, April 02, 2007 2:14 PM
Subject: [WanderlodgeForum] Leaking air when braking


Coming home from the weekend in my BB last night, I was in some heavy
stop and go traffic, and I kept hearing some hissing of air whenever I
applied the brakes, and watched my air pressure begin to go down
noticibly when the brakes were activated. When I let off the brakes,
the hissing stopped, and the air began to build up normally. The air
sounded like it was somewhere street side, toward the middle or front
part of the bus. It was like an air line to a wheel came off, but the
brakes worked fine. The air got down to around 70 PSI, and after about
5 minutes of this 0-10mph using the brakes only when necessary (big gap
to the car ahead of me) everything return to normal...no more hissing
on braking, pressure built up to around 125-130 PSI and purged from the
dryer, etc, and the rest of the 60 or so miles home were uneventful.
Don't we love these intermittent problems....

Something stuck, and now OK? Something to look for/replace? Since it
is OK now, where should I begin to look? I was afraid of getting stuck
on the So Cal Fwy's when the air got down to 30 PSI and my brake button
popped...ideas??

Kevin McKeown
Yorba Linda, CA
1986 38' PT





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