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I replaced my trailer control valve as that is what was causing my air at rear glad hand. I started tracing the lines back from the front glad hand and i think they had this problem while it was in service because the check valve at the T is new. It functions correctly so i moved on to the the...

I removed my Trailer supply valve first, it only has one line going to the floor all the rest feed off the other valve, it's tight but not that bad, you can hold the fitting with one wrench and loosen the nut and make great progress. It's full of gunk but the o rings look ok. can't figure out...

Defiantly post up the numbers! These should be serviceable and may just need an o ring replaced but you never know. I'll dive into the check valves first.

Did you solve this yet? Mine is leaking from the front and rear emergency gladhands. Going to work some oil in the tractor protection valve and the control body and see if that helps.