Sticking Air Valve

[Oonrahnjay]

If you do find a sticking valve I would rebuild it or replace it with a rebuilt valve.  The air system is critically important to stopping your bus.  You don't want to end up stuck somewhere because of a bad valve.   

True.  Protection valves (which don't open until they're fed a certain pressure) and regulator valves (which supply a fixed pressure lower than main pressure -- like one that doesn't allow more than 90 psi to the door system when the rest of the system is 120 psi) are more complicated but plain one-way valves are pretty much simple as rocks.  Open them up, clean 'em out and you should be ready to go; of course, if there's wear on the little ball or shuttle or wear on the seat, then it's probably a good idea to just replace the valve assembly.  Also, have a look at the ones that don't seem to be giving trouble.  I found a new one that I'd installed on my bus -- it came with the two body halves loose and it was leaking a bit of air; a simple tweak with a wrench tightened it up but there's always the possibility that they may leak.  As Brian says, all of those valves are fundamentally important and reasonably cheap.

[kwood]

Thanks, everyone, for the ideas.  Looks like we are going to be cold for the next few days.  I will try and take a look again this weekend.