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Cummins # 208087

Bad Q2 valve. O'Reillys # 229505CX or napa 229505x

Pull the middle line off of the q2 valve in front of the front axle and see if you have pressure at that supply line when it is depressed

Or a bad q2 valve if its dumping air out the stack

Rear brake setup. Front is the same it only pivots on one end though

The one on the end cap. The tube that controls the wedge has 2 lines and a rubber diaphragm. the one on the frame side applies air. It forces the rubber diaphragm in and actuated the wedge and brake. The other line on the inside vents the air when released.

The shoes didn't move? Ensure you have air going to the chamber on the lines in. Are you having any air loss on the tanks with the brakes applied? You could have a blown brake diaphragm which will not allow them to apply. If you remove the line on the end of the can side and use an air gun...

Self adjusting wedges. Ensure your wedge is kicking out like they are suppose to. They can rust and get gummed up and need lubrication to get them to move their full range of motion. You can remove the drum and apply the brakes and see what movement you have. May pull the wedge apart. Pull...