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Yea, there are some folks on here who have described how they “fixed” the valves...

Cool, sounds like you are closing in on it. Using your gauge were you able to determine if your patched protection valve was responding consistently? if it isnt, that could be part of the issue(valve closing off air before the switch opens telling CTIS that tank pressure is low)... Could also...

Yep sounds like the protection valve has issues. Have you disassembled it yet? I think it has 4 small bolts to separate the housing. Sean Fillner did a short youtube video on overhauling one in his Abel LMTV build series. It basically works like the wheel valve just with an adjustable spring...

For your flat tire, this is a simple check for a leaking wheel valve and what it looks like when it leaks. I had a tire that would slowly loose pressure. With the tire inflated, I removed the banjo bolt and slipped a rubber glove over the banjo fitting and sealed it to the end of the hose line...

The tank will fill to 120 PSI as long as the CTIS and cab air lines are not dumping all the air:) if those lines are open the tank wont get above 85 psi as the protection valve will send all the air over 85 PSI there. Right above the protection valve is the CTIS pressure switch. It is open...

It is not a regulator, it is a protection valve. It only allows air out to those 1/2” and 1/4” lines(ctis and cab air suspension) when the wet tank pressure exceeds 85PSI. If the pressure drops that low it stops sending air to those accessories and saves it for the brake system. You need to...

In the back of the 20-1 thru 20-5 manuals there are schematics. The air system drawings are in there with the rest of the electrical info. If the power steering is bolted on the back of the compressor and gets its drive from the compressor. if it is working that means the compressor is at...