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I also learned from another thread that the brake treaddle valve will leak air by to stack a sticking valve in it. So when truck is parked 30 min later no air

It will dump all air as long as foot is on brake peddle. Q2 valve is dead center front. Hanging in front of engine. Can't miss it. It looks like it should not be there

K9 there is no danger in the front to change diaphragms. Only on the ones with spring brake. Those are the ones with holes in the ends of the canister. When the q2 valve is bad you will dump all air into vent stack every time you hit the brake peddle.

Its that q2 valve when you hit brakes and that valve bad it will dump all the air into the vent stack. There's what looks like a nylon ball in that valve that breaks and will not hold air when you hit brake pedal.

Its the q2 valve under front bumber just in front of engine.