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In CT I can just make a bill of sale and reg anything over 20 years old they dont care.

Just have a generic o ring kit. Spare schrader valves and the valve screwdriver is good to have too

Get hands dirty take it apart and put it back together. On the side of the road isnt the place to learn. Its not hard to do. Be brave.

They are around. The valve housing is aluminum easy to strip the threads. Rubber piece lasts pretty well. You should take a front and rear assembly apart and put it back together to get an idea what you are dealing with.

Its a friction fitting on the rear hub stem. Nut compresses a big rubber piece. Its a bad design.

Just take it off the wheel you are replacing and put on the new. Good to have a generic o ring kit and make sure the hand tools you have fit the fittings. The rear wheel valve nut coming off the hub stem if you have that style needs a small adj wrench with a wide mouth.

You wont be driving with a wheel off. You can unplug the controller and the cab valve wont do anything.

The m939a2 system is first gen and requires the proper maintenance to be reliable. Improperly sealed o rings or old leaky wheel valves cause flat tires. Not the system itself. Moisture gets into the wheels because the air dryers arent properly serviced and its all down hill from there. The...

You can reach your hand right up to the stem

It does the pressure check and then a quick vent out the release valves. A leak is detected. Put your hand on each of the rear wheel valves. They are pressure held on a stem coming out of the hub. The bracket dosnt do much for them. Centrifugal force pulls them off the stem and you have an air...

The air dryer is good to change or service. It is not causing your ctis problem though. If the system starts with hwy flashing and when you have around 120psi it does the pressure check and you get 5 flashing lights the system is probably detecting a large air leak. Check the rear wheel valves...

A bad hub seal will do that. It tricks the mechanical valves into thinking its air dump time by diluting the fill air pressure sent by the controller/cab valve.

Rear wheel valves slip up ftom the hub stem. It's a bad design. You need someone at the wheel to listen for air leaks when the system is pressure testing. If you hear a siren sound then it's a bad hub seal. You should also check and make sure someone didn't block the system off with schrader...