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Ahh. Still sort of new eh? Look at the top of the page, on the menu bar. See the "User CP" and other items across the top? Look for the resources link, the drop down has Technical Articles, Technical Manuals and other resources. The Technical Manuals link has the various TMs available for...

Get the M105 TM and run through the troubleshooting section. I think there's a valve system there that could have seized.

There is a valve. But that's usually back on the very back of the truck just before the glad hand. Follow the line back to the tank. It should run directly into the tank.

Correct. The Driver side, Red ie Service proviceds baking signal actuation to the trailers. Tells the trailer brakes when to apply and controls them. The Passenger side, the Emergency side, provides constant air to provide air to the trailer for it's emergency brake system (if present). That...