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PT & WB (Twin Axle Pusher Unique Issues) If you have a unique issue with your PT or WB model coach and it can't be answered in one of the other forums here, then this is where you can list it....list your PT Parts here too.

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Old 09-23-2019
pauleburgess pauleburgess is offline
Senior Member
Join Date: Oct 2015
Location: Houston
Posts: 201
Default Buzzing from air system

I've been crawling around under the front axle, and there's something buzzing when airing and aired up (I'm doing this in a way I consider safe). When I turn off the engine, it still buzzes. I can hear it from the driver's seat-- when I mash the brake pedal, and release, the buzz is gone briefly then comes back. I know the air system leaks down rather quickly, do not know if this is related.

I thought I read about this recently, but I can't find a thread of such.

Any ideas?

Paul Burgess
Houston, Texas
1986 PT-40
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Old 09-24-2019
ejallison1 ejallison1 is offline
Senior Member
Join Date: Feb 2008
Location: Kansas
Posts: 667

Open up the genny tray and take a listen there. There is an air valve thingy that has to do with the brakes that is up towards the ceiling of the gen tray under the drivers seat. Called a SR1 valve. It is behind a metal plate. SO if you can hear the buzzer/leak better after opening the tray that may be your culprit. Hope that's not the problem as it's fairly inaccessible. Pics--pg 2:

Hopefully it is just a clippard valve behind the front load center or if it is this SR-1 then maybe MMO will cure it!
Ed Allison
1986 PT 40
"Gypsy Rose"
Kansas, Il
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