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Checked the relief took it off and manipulated it, it's in great shape, no clogs, moves freely. The system does deflate the tires quite quickly and quick release valves seem to work as intended. 1) Faulty PCU relief valve - Checked and as far as I can tell this is good to go. 2) Leaking upper...

Getting a new software and hardware to do that is on my list of things to do, still waiting for my title and registration to process through before I spend more money though

It does sound like it's working properly, the controller just doesn't like that a pressure is slightly out of bounds on the relief valve. Atleast my best guess at this point. Manually actuating all the solenoids, all are functioning properly best I can tell.

My truck didn't come with a CTIS controller but I found a "probably broken-untested". Plugging it in and it seems to work as it should, electrically at least. I had a missing quick release valve for the front axle, then both hub breathers were disconnected, then found a hub seal leak, then the...

Well you were right about it being a valve. Looking closer it appears to be an intentional bend in the little lever. It rotates 180 degrees easily and it appeared to back flow. Still seems to run itself dry though when I put back into original position. I'll work on checking that return line next.

This is the one I have. That little metal tube sure looks like an overflow.

The pump does work normally until it runs out of fluid. Thanks for all the other info. I'm not sure mine is a sealed system as there is a short metal tube to the right of the handle. I think this may have been and a1 change as others I've seen have no tube?

When using the manual pump for any operation, it will run empty and not pump any longer. Thinking the fluid might be a little low, I refilled the manual pump tank, but I'm noticing it's pumping fluid into the air over oil pump reservoir, this caused it to overflow. Guessing is a check valve...

I don't have access to the A1R documents but it seems this QS4 version is the correct one for my truck. Dimensionally it's the same and the coil has the same resistance. I do have a single orifice to the intake. It bolted up the exact same also, currently fully installed. The replacement...

Was considering it, but may just go this route https://adaptiveoe.com/dot-lmtv-fmtv-front-brake-and-ctis-hose-upgrade-a0-a1/

This is for the frame to hub, but there are 3 sizes, 13/32 for brake, 1/2 for ctis fill, 5/8 for vent. Those are the hose sizes, the fittings are more complex.

I'm having a hell of a time spec'ing the correct hose. When selecting 100R5 (air brake hose) they have no compression SAE fittings available. Using removable fittings, they are still limited and cost is $132 for the hose. It's not a brake line so other hose could be used but not seeing a good...

Have been chasing down why ctis wasn't working. Replaced a leaky hub seal, rebuilt a few wheel valves, but still wasn't working right. Today I found the front fill line to the hub is super porus and a spray of soapy water resulted in a foam party. Time to find a hose builder

Pretty sure he is using ACU or similar, aluminum covered plastic core.

Sounds like I currently have that QS4 version then. The TMs I have don't have A1R info unfortunately. I would love to get a copy, currently all I have for A1R are the electrical diagrams, which have been extremely helpful.

Saw that. No luck contacting Quick Start either. Sure would be nice if they had a designation datasheet. I imagine some of the modifiers are for bottle thread side, materials use, solenoid spec (12V, 24V, continuous), port location, size, electrical connector, and thread types. The QS4-6SS...

Thanks!

Part number is QS5-5CTP, NSN 4810014428695. Not finding them in online searches but I know there must be a ton out there. Any leads?

If you are aware of solvent that can dissolve aluminum oxide and the galling/corrosion I'm all ears. Unfortunately the solution of this issue (using the special cap that is literally right next to the valve) was not used so water got inside of there and the whole thing completely seized up.

2007, no part number on the part, haven't looked in TM yet