[Jrahn56]

Looking for the location of where the supply air tanks might be located on Coach #375 (1995). Original problem was the coach would not pump up above 70 psi. Replaced air governor and PPV, now I get above 100 psi, but as I turn off the coach my supply air goes to zero within 5 minutes while my brake pressure holds. So, I I'll start at the supply tanks and work from there, as I still don't an air leak. I've used an external compressor to eliminate the noise of the motor. Open any ideas.

Thank you as always for your insight.

Jeff 

[cwl1979]

Mine are up in the frame rail between the drives and tag axle. Ping tanks are part of the frame structure and are square in between the frame rails.

Do the air bags drop at all? A leak that fast should be audible.

[Jrahn56]

Air bags drop. No sounds of air hissing which is strange.

[cwl1979]

Honestly that would lead me to believe you have a bag with a very large hole in it. Once the bags are inflated they will leak out the air, once it rolls under itself it seals it back up. If your coach is still blocked up and safe to get under, i would air it up and physically touch every airbag. feel the bottoms of every one of them. when you feel a breeze you'll know what one is blown. This spring when i replace my airbags I'm going to install 1/4 turn valves on each air bag so i can isolate them individually. Also good for getting to a safe spot if one goes out on the road, just shut it off and keep going.

[Richard]

With the key off, the air bags should be isolated from supply air. Unless you have it in autolevel mode.

[Jack Houpe]

I suggest buying an ultrasonic leak detector, a leak that big will show up easy even on a cheap model.

[Jrahn56]

I just bought an ultrasonic leak tester, getting it Wednesday hopes that tells me where my leak is at.

Thanks again,

Jeff

[encantotom]

i have found using a closed ear headphone works best with my ultrasonic leak tester

tom

[Jrahn56]

I'll give it a try.

Thanks,
Jeff