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Yes I have, It does not lose air and cuts in and out with in limits. Low buzzer comes in as it should. Will get a new reg. and try that next.

Thanks, some good ideas to try.

OK, I have put a complete new air dryer on the truck and I still have the same problem. It just looks like the air compressor is coming on to soon.

Is the expello valve in the compressor head?

Grimpyrobb, I do not know how to change the turn on PSI only the turn off psi on the reg. Suprman, I saw the little line that runs back to the reg. (governor).

Yes that is the first thing I did.

What is the pressure that the air compressor should turn back on? The problem I am having is that the Air Dryer is popping off a lot. The truck builds pressure ok and the Air Dryer popes off the at round 120psi and it looks like the compressor comes back on at about 110psi and builds back to...