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I replaced the valve and the front brakes work great now, thanks for the advice. Unfortunately shortly after pulling out of the garage it lost power and would hardly run, I open the hood and diesel was spraying out of the fuel shutoff valve, the arm had broken off. So any advice on where to get...

I pulled the line off and it has pressure going to it when the brake is pushed, but nothing is coming out to the wheels.

I put a pressure gauge on the supply line for the brakes and got no pressure at all when the pedal is pushed.

I rigged up a fitting so I could apply air to the actuator, and the wedge and shoes moved freely when I applied air. I believe that means I have an air supply issue.

Yes the shoes didn't move not the drums, so which line do I apply air to? I have never worked with air brakes before.

I pulled the drum off and had someone push the brakes and the drums didn't move.

I am working on a 1982 M939 that the PO said the front brakes don't work that well and need adjusted. I pulled a front drum off and didn't see any adjustments, the drum and shoes are in great shape with plenty of material on them. Is there an adjustment for the front brakes or are they self...