A large leak on the upline would not matter. The up side is shut off when you put the valve to down. You just cant go back to up and then hit the brakes, because it would port air out the exhaust side of the gear valve. Just leave the switch down, and hit the brakes. No extra channel needed on the receiver either, as all is mechanical. i will try to get time to give it a try tomorrow. It will work. It has too. Just simple physics. Bob