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Thanks, I agree on the off the shelf but the cool thing is they design alot of this stuff to be taken apart in the field. We took the double check valve apart and it had an o-ring so it was easy to clean and put back together. I'm not surprised it had sand/mud in it after what we put this truck...

Found the problem. It was the double check valve located next to quick release valve under drivers side step. We followed the TM on tests and found no air was in line from quick release to double check. We pulled double check valve apart and found sand/mud had slide plunger stuck in the middle...

We did that. It's releasing through intake. I've read the TM on it and we will perform the tests to determine if its the quick release valve. Sounds like that's the culprit under the drivers step. Thanks for the feedback everyone.

We checked spring brakes for diaphram leaks. No luck. It appears to be a stuck release valve or relay valve somewhere. We disconnected each spring brake can one at a time. Prior to the issue arising we had been mudding the truck heavily then parked it thereafter. When we started it an hour later...

Thank you, I was hoping for experience on the issue. We troubleshooted for several hours in the field and resorted to caging them to drive it home.

I tried searching threads but didn't see any answers to this issue. I'm sure someone can point me in the right direction. Weird issue. Truck is a 1983 M925 ran/drove great. Parked it and an hour later went to drive it and the parking brakes wouldn't release. Even using the Spring Override all I...