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It is on the side of your shifter where it plugs into. It has diodes. check with Andy6x6 he did some rebuilds on it. Should be a thread somewhere.

Bad control unit more than likely. It can be rebuilt.

Right behind the drivers step. to the rear of the air cleaner. You will see it there. Little Valve. Will have a T fitting on it and one vertical looking half cylinder and one horizontal cylinder. The little line coming in from the top supplies air a secondary to that. The Rear large 1/2" line is...

Make sure the tank below you drivers step has air. Im sure it doesn't if you didn't hear any air when you hit the override valve. That allows air to go to the rear spring cans with the linear valve off. https://youtu.be/ELcWO5Q2A1w Sent from my SM-G935P using Tapatalk

Has it been sitting? If so. The brake shoes are prob stuck. Being that you hear the air dump means your linear valve on your emergency brake handle is still applied and not releasing. The treadle valve bypasses air to the stack when the pedal is applied and the linear valve is engaged since...