I once had turnpike doubles. The brakes were not properly adjusted-causing the brakes to smoke. One of our mechanics made a road call, and got me back on the road. At the turn around, my old meet driver had problems with the brakes not releasing. He calls his mechanics, and agrees to do what the mechanic told him to do over the phone.....disconnecting the air line from the brake chambers, crimping them off with cable ties....I asked my meet driver if he ever has done such a thing. To which he said, "no, but these trailers have to make service." I told him that he was a fool for working on an air brake system with no knowledge-and making service isn't worth putting other lives at risk if anything went wrong. My point is, do not work on any UPS equipment just to make service. Service is important, but when it puts others lives at risk it's just not worth it.