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As the original poster, it’s been awhile for me, but thanks for all the replies. I now have a much greater understanding of the system. In my particular case, I believe that two of my wheel valves are not functioning correctly, as air escapes from the little orange plug on the wheel valve until...

Bobferrin, I have a couple of questions/comments. 1st, I noticed in the TM that they want you to test the OHMs to ground at the controller and the manifold. Did you do this? 2nd, where did you find the seals for your hubs? Thanks for the informative write up, this will help me...

Well I tried the CTIS system again. And found Gear lube all over the back-back dif case. Looks like I'll need a seal in there sometime soon. Anyone have any experiance with sourcing/replacing these seals?

Any chance you could talk to them about my questions please?

Thanks, this is the best description yet. On a side note, does anyone have a used, take off wheel valve they would donate/sell cheap so I can take it apart and rebuild one at a time so my truck isn't down for a period of time? Thanks.

This is interesting, however, I wonder if it may work in reverse. By sending a low pressure pulse to open the tire valves. Some of the reasoning is that, we are sure the air comes and goes thru the same hose. And the brakes want/need at least 60 psi to work, so that would explain the 90 psi...

I had slow leakage problems also, this happened even with the CTIS off. Took the truck to a heavy truck tire shop that had a guy there that used to be military, and they would work on the wheels/tires. We found slow leaks on 4 of 7 tires. Replacing the wheel "O" rings and the valve stem "O"...

I have a few questions on CTIS Theory, not how to operate it, not how to remove and replace parts per the TM (I read that part). I’m interested in how it’s supposed to work at the design level so we can troubleshoot our problems more intelligently. So here are my questions, and some...