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Air brakes are bulky and cumbersome. At least the air chambers are. With Juice brakes, the brake mechanisms are tucked away behind smooth backing plates. Air chambers would hang out on one side or the other, of the axles. I would not be so concerned about the air lines, as much as I would be...

Question is a little vague, but if your refering to the Emergency line on the truck, when hooked to a trailer (w/air brakes), it merely supplies air to its system. If the air pressure in that line is cut off, with the Tractor Protection Valve, or by accident, the trailers Relay/Emergency Valve...