Alright, I have a driver's rear hub seal out. to clarify my symptoms in my first post, ALL my QRV's were leaking, I only thought the front one was. So the system would try to make HWY but the air was escaping out the QRVs. I was able to locate the offending hub by airing all 6 tires up to 70psi, then running the truck and going wheel to wheel after it was up to pressure and the system was trying to fill the tires. When the solenoids open in the cab and try to flow air, the leak would stop becasue the qrvs would close. It didn't leak down sitting because the QRVs would also close. But when the system was working (after hitting 120psi, and until it dropped below 85psi) it would open the wheel valves and I could hear/feel air rushing out all the QRVs, and also the brake drum on my drivers rear. The vent on that axle didn't look oily as others have said ight be an indication of a leak, but mine seems to have happened all at once, so that may be more of a long term indicator.
So, I guess I'm looking for right ups on fixing a hub seal. Of course, I'll look at the TM's to start, but I like real world experience and videos if I can find them too.
One quick question to verify, If I need the truck until I can get it fixed, if I unhook the big plug on the CTIS controller and air my tires up individually it should be safe to drive? The only time I have leaks is when the CTIS is trying to work. I have some construction stuff going on and may need to make a 20 mile trip to the lumber yard.