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There is a check valve behind the passenger side bumper that is part of the brake air release. I have heard of that check valve sticking and causing brake issues.

Fleetpride usually has the parts at one days time availability. I'm spoiled I keep parts trucks around so when most things brake I have the parts to swap out.

There is troubleshooting flow charts in the TM but the tractor valve is a likely culprit. There are several diaphragms in it, the rebuild kit has them all I believe. I speak with alot of lmtv owners. All of the trucks that sat unused for a period of time, especially in a hot climate seem to have...

Leaking all over is usually indicative of the tractor valve needing rebuild.

How were the driveshafts/u joints removed? Hammered out or removed with a correct puller tool?

Are the brakes caged? If it came with removed driveshafts chances are they are caged. Look for bolts sticking out of the rear brake cans. The truck will need to be chocked. You need to read the operators manual and familiarize yourself with airbrake operation. It's a big a heavy truck and things...

Brake pedal should be nice and firm even without air in the system

There is a thread somewhere with the rebuild kit part number. Does the pedal feel spongy or firm?

If air is leaking up around the yellow knobs shaft then that control may need replacing. Air should not escape from it like that. Air could be leaking thru the treadle valve also. Seals dry up and go bad from sitting especially in hot climate. Use windex to identify the leaks exact location.