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I do finally understand how the system works. Last night after I whipped up that manual setup from the other post to bypass the pcu, the tires aired up normally to 80 psi. I closed the supply line valve, opened the dump valve, valve whoshed, qr valve whistled briefly then it was good I thought...

It dumped to 10 psi the first time. After put that manual manifold on it only the front right dumps and it stops between 50 and 60 psi. Held there over nighti just checked it. Other 3 are at 80

Best way to try and track the restriction on that line? Hook to shop air and go hunting?

I'm a member of the volunteer Fire Department and we bought two of these M1078 2.5 ton trucks through the state about 10 years ago. The ctis has never worked in either truck we just aired the tires up normally in the spring and fall when we use them. Monday out of blue after a call, the dump...