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Some one has changed the air brake can on the trailer in the past. You have a modern clamp ring air can on the trailer. The correct air can should be held together by a ring of bolts like on the M105, M1061, M146 and other military trailers. This setup of using only the air can was not used...

You need to I cage the brake can and recheck the function. It sounds like the air lines are reversed.

Air brakes are fairly standardized. The red line is used to pressurize the system and release the spring brakes. The blue line sends a small amount of air to the relay valve that uses air from the tank connected to the red line to apply the brakes. If the air lines are correctly hooked up this...

I have never seen a system like this. Usually the red, emergency, line pressurizes the system and releases the spring brakes. The blue, service, line sends a small amount of air to the relay valve that opens up to let air flow from the tank or emergency line into the brakes. That threaded rod...