Bendix AD-9 dump valve seems to get stuck on.

What does it look like?

You can also bypass the dryer with a fitting or 2. Or new hose.

 

Seriously don't bypass it, that is just plain lazy,

JUST REPLACE THE ENTIRE UNIT. it is old and should have been replaced.

They are CHEAP ... and easy to replace.

 

OK I read to fast. 10 psi in 30 minutes? Just drive on, not worth messing with. Replace or rebuild dryer first chance you get.

 

If you have some wrenches and need to get going, take the two big air lines loose from the dryer and connect them together. You will probably have to take that 90 deg fitting out of the dryer and use it to hook them together. I have done it many times, even on side of the road in 10 deg weather. That will bypass the dryer until you can get a new one put on.

 

Tight on cash just bypass it. Drain your tanks every day when you stop for fuel. There cheap and easy enough to replace. But if it has to wait a couple weeks, so be it. That line hanging? Who knows you will have to trace it, and tell us what it is. Or at least where it goes.

 

Best option is to leave it alone. 10 psi in 30 is nothing. I wish that's all mine lost in 30.