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True, sort-of. Depends which gladhands you are sealing, and what the issue is to begin with.

Well I found the issue. After going thru every valve on the truck and finding nothing, I should have stuck to my gut. Some clown had the dash valves hooked up wrong. system works great now!

Thanks Will, this is a new truck. Suspecting something is hooked up wrong. I introduced a small amount of marvel mystery oil to the air system thru one of the hand valve connections, cycled stuff for awhile and accomplished nothing but a nice mess. With the park valve released (air dumping...

I pulled out the tractor protection valve and disassembled. Like the others, everything was clean amd new, seals plyable. It appears that the rear emergency gladhand just passes thru there? I didnt see any fuction of that valve relative to the gladhand circuit. any insight fellas?

Is the trailer park valve the only stop in the park release air? In other words, if I had the exhaust line pulled off the trailer valve, When I release the park valve, no air should be leaving the trailer valve dump? Or is there something else down stream? This really seems like a dumb question.

The yellow valve is the park valve. the red valve is the trailer valve, but no, it is not on. I wonder if someone had the valve out and put it back in wrong.. I hope not, those things suck to do.

1997 M1078. When the park brake release valve is pushed, the air continues to exhaust from the rear emergency gladhand. I have pulled the three valves apart behind the washer bottle, all three were good. The truck recently went thru a rebuild, so this wasnt surprising. I have looked thru...