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Gotcha. Thanks for the info.

Exactly. Enough pressure to make rear wanna dump but the controller is calling to air up so it shut down.

Found the issue. A line was “replaced” once. They spliced into the supply line and when they did they used a small inside diameter hydraulic union fitting. I put an air line union on it with proper inside diameter and it fixed the issue. thanks for the help guys now I understand how this system...

100% coming from the bottom of the valve. I donno the history of this truck. I feel like there is a line somewhere not connected in the correct stop. Issue is I don’t have a good schematic.

you cant swap lines on the valve. The supply is a completely different fitting type. This is annoying now lol

New manifold, new quick release valve, new CTIS seals, good wheel valves and no leaks. Still blowing air out the rear quick release valve.

no oil coming into the wheel valves. Just opened all of those and cleaned them up. Waiting on the other guy to put hub seals in and we will see what happens.

iv worked on these for 20yrs but usually we just ignore CTIS lol. Will a leaky rear CTIS hub seal cause the air to just dump out of the rear quick release valve? We are doing seals just because we got them. We have no other leaks at all. Iv been all over this truck.

Long time lurker, first time poster. In my shop we got a 1078a1 with the following CTIS issue: 5 flashing lights. After starting I get flashing highway light. As soon as the air builds up and purges from air drier the 5 flashing lights start. I hear the CTIS manifold try to supply air, at the...