Front air bags deflating

[George Lowry]

The system is quite common to all the coaches with air suspension.
You have a height control valve that adds or releases air as necessary
to keep the height above the axle the same depending upon atmospherics
and/or load variations. Normally this valve has a delay built in so
that gong over bumps does not trigger a change in air pressure.

The valve should be rebuildable. I would check to see if there is a
kit available. (I know they are for the GM coaches.) If not, then you
may have to change the height control valve. They usually run around
$50 and are easy to change. The lines from the height control valve
including connections, and the bags themselves, may be the cause of
the leaks. Sometimes it only takes a 1/4 turn on a fitting to stop a
leak. That is where the ultrasonic leak detector comes in handy to
determine just exactly where the leak is. Without it is trial and
error, or possibly using a soap spray.

Hope this helps,

George Lowry
'95 WBDA 4203 & GM 4106 (for sale)
Spearfish, SD



Curt Sprenger wrote:

> I have the same problem but the time is an hour plus. Will be interested
> in the replies.
>
> Curt Sprenger ‘87PT38, Anaheim, Calif.
>
>
> jdlashua wrote:
>
>
>>My front air bags deflate about 5 minutes after I secure the engine.
>>The pressure gauges for F/R air tanks remain good. The low pressure
>>warning light doesn't come on. I've dumped and refilled several times,
>>but still does the same thing when I shut down. Is there a check value
>>in the height adjuster or somewhere else that may be giving way or am I
>>looking for a slow leak in one of the lines. Anyone have any advise how
>>I troubleshoot this?
>>
>>James Lashua
>>84PT40
>>
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