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OK, I solved the problem a few months back, but I am just getting around to sharing the information, because I needed to find the graphics. Here is the answer to stuck FMTV brakes....you ready? Plugged gladhands or gladhands that are too tight (usually new). Bend them out a bit so some air...

Still suck...hating life....it must be a valve stuck on somewhere. Not sure how to tell.

Thanks...so far no luck.....I will have to use another truck for the event. I spent so much time on this darn thing lately. Oh well, Murphy strikes again.

Thanks! When you say drain the system, you mean purge all the air out, correct? I don't think its air over hydraulic, so we are not talking about fluids.....

The truck was working fine. Then all of a suddenm, the brakes or parking brake are stuck on. The truck will go into gear and it tries to move, but seems held down. Every once in a while if I mess with the air brake engage knob, the brakes will get released and the truck can roll forward...