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Ctis safety valve https://www.arnasmsl.com/index.php?main_page=product_info&products_id=650875

I forget its an ABS truck so the vent won't go to the relay valve. so On top of the axle. You should have a tree like below. The one that has the big lines that has the white nylon plastic lines below it is the one you want to remove. scrape the paint off the lines to show which one is...

You said you replaced all the service and spring brake diaphragms in the rear? A bad one can cause it to vent to the intake. You need to narrow down which axle. Go to the rear most axle. You should have a port on the brake relay valve that says EXH. Remove it. See if you have air there...

Well if the cotton valve from the treadle valve is still leaking then it is a faulty valve.

Forgot its an A2 truck that some moron redesigned OK. So you have no air venting on that cotton line that went to the treadle valve like you did before that goes to the intake? That is good. So apparently you have more than 1 issue. You said its the primary side not building air. Let's go...

There should be 2 valves on the wet tank. The secondary and the primary. Primary is on the front of the tank. Secondary on the side of the tank on the top near the frame. The one isn't normal by far

In your pic of the wet tank. You have those 2 valves on the side of the tank. The one on the right is the emergency gladhand supply line. Where does the one with the valve go with the red large line on it? That is not a normal setup. Meaning only 1 line, 3/8" supply line should come out of...

Its cheaper without the pedal and just swap yours over https://www.eriksmilitarysurplus.com/airbrtrvafor1.html

the bottom hose fitting should be the vent. So yes. Top two are supply. Next 2 down are delivery.

That cotton jacket hose probably goes to the lowest connector hose fitting on the brake pedal. Remove it at the pedal fitting and see what you have. It doesn't go to anything on the engine

Yes. When you have the air escaping from the stack. Remove one line at a time till you find out which one has air coming out of it. And send me a pic of it and what direction on the truck it goes Those two lines on the bottom going to the front of the truck. One goes to the Q2 valve. One goes...

Close the primary tank valve on the wet tank under the truck. Air the truck up from a compressor. See if the secondary takes on air. If it does and the air is not coming from the stack we know its on the primary side. Repeat this test with the secondary valve closed if needed. Or On the...

Napa 229505x. Oreilly 229505c

If the truck wont air up with shop air then it is an issue somewhere else. A check valve at the air dryer prevents back feeding to the compressor

If both emergency gladhands are close i would start by Spray around the spring brake cans.