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If the hub seal was bad, leaking air pressure can cause the wheel valve to see low pressure and dump air. Wheel valves are mechanical. I think its around 20psi holds open the wheel valve and dump down to around 20psi. So if the system is sending say 65psi to fill but only around 20psi makes it...

If something is blocking the hub port, where the banjo goes then the tires can mysteriously loose air. A main culprit is a regular bolt in place of the banjo. If the wheel valve is bad and air is leaking back thru that will cause a pressure drop but a working system will usually keep the tire...

For some reason that tire is seeing low pressure when the system goes to do a pressure test and its allowing the wheel valve to open and drop pressure. Take the banjo/hose off, put a plastic bag scrunched down over the banjo/hose and rubber band over the hose tight. Give it an hour if bag...

Ok was the system working fine before? If you havent 100 percent visually verified it already pull the bolt out and verify that its a banjo bolt and not a regular bolt.

Take the banjo bolt out see if your spare had a regular bolt not a banjo bolt. You can remove the ctis hose off the valve stem and screw in a standard schrader valve. Then just fill the tire with air. Be careful when screwing in the schrader valve you dont want to over tighten it in. You can...

Around the center metal nut piece with a hole. I have seen these with the metal housing significantly corroded though. The rubber flaps seem to go bad with age. There is a rebuild kit available though. I think it has a new flapper, spring, center metal piece and 4 new bolts to hold the valve...

The ctis is basically the same system as the m939a2 trucks have. The flappers are rubber and they age and dont seal well, moisture will corrode the valves metal body over time and the flap cant get a good seal. Chemicals sprayed in will cause damage. Best way to help the ctis stay working is...

The line that comes out of the rim on a banjo bolt going to the ctis valve. If air is leaking back out thru the valve then that's where it will come out. If the lines from the stem to valve are leaky windex should find that. The wheel valves are probably a scheduled replacement item. Moisture...

In the parts tm

Yes. Take the feed line off. Not the one from the valve to the stem. Scrunch a plastic bag around the line use a rubber band to hold it on let it sit for a while. Leaky valve will inflate the bag. Use windex around the 2 piece rim look for bubbles those will be air leaks.

Dosnt work like that on an lmtv. Most wheels you can't just screw in a schrader valve.

You can find resting leaks with windex. Sometimes just an o ring or something tightened up is all that's required. Disabling the ctis will only prevent automatic reinflation when you start the truck. The wheel will still leak if it leaks when sitting with the truck off now.