[cvwiggs]

We are in Jackson California. As we're leaving the RV park I noticed I have low air pressure. Now the brakes seem to be set coach won't move. Does anyone know of any easy checks or fixes I should check as I wait for help? This is a 1974 Newell with the 1160 cat Allison Transmission.

[encantotom]

either your engine compressor is not working or you have a massive leak

did it air up ok when you got ready to go?

tom

[Georgeb]

Could be air governor

[encantotom]

i sent an email with my phone number. feel free to call me

tom

[kyleb]

Check your air dryer purge valve. Usually on the bottom of the air dryer.

When they fail, you won't be able to build any air pressure & you can't hear the leak due to the noise the engine is making.

[cvwiggs]

Thanks Everyone. Good news is it ended well. We made it home.
I borrowed a small air compressor from Jackson Rancheria RV Park maintenance guys (this is one of the best small RV parks you will ever stay at in California, google it). As I aired up the coach I noticed air leaking fast from an unloader valve or governor (I don’t really know the terms) under the coach by the rear air tank. So with the coach supported I slid under the coach and tapped it with a hammer. It quit leaking, well almost quit. Anyway the compressor aired the coach up to 120 psi and then when I started the engine the coach’s compressor was able to maintain pressure between 90 – 120 psi all the way home. I will be taking it in to http://www.tabsupply.com/services later this week.
You were all great with your suggestions and offers of phone help. By the time I saw your replies I had already received a phone call from a friend in another RV group. He is the one who suggested I find a compressor and try to air the coach up.
What did we do before online forums?
Thanks to you all!

[77newell]

If the valve is attached to the bottom of the rear air tank it would be an automatic drain valve that dumps any liquid that collects in that tank.