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There are plenty of hoses and valves on those trucks. One thing that helped me was to isolate the air tanks. There should be shut off valves on both sides. It helps to rule out one system at a time. Even if it's not a leak. Good luck.

Yes. Pressure up the system and shut the truck down. All leaks should be sent to the hoses going into your intake pipe. Follow the air back from there. My leak came from the foot valve. Everything worked fine, but air went to the brake pedal and was able to billed off. Also, these trucks build...

will have to wait until the weekend. thanks for the word of caution. I hear those are some heavy duty springs.

I can hear it leak from the air intake from when the engine is shut off until the tanks are empty. No doubt that's it. I am not sure about isolating it. That sounds like a good start. The TM lists my probem word for word. I just can't figure out their troubleshooting guide. Air leaking into...

So, the truck does hit 120 psi at idle, takes roughly 15 minutes. It's been like this from the start. Bleads out in about 30 minutes back to zero I did the old soap and water trick on the entire truck. I hear some air passing through the air brake but not leaking out of it. I hear air coming...

PRIMARY AIR SYSTEM FAILS TO MAINTAIN PRESSURE (NO MAJOR LEAKS, AIR CAN BE HEARD ESCAPING INTO AIR INTAKE STACK, PARKING BRAKE APPLIED) This was the problem statement I found in the TM. Wasn't able to figure out what test they wanted me to do or why there are pressure lined in the intake stack...