How can the trailer behind the semi-trailer control the driving brake and the parking brake, while the tractor has only one air supply pipe and one control port behind it?.
Spring is a roll and trailer tug fingers as thick this special once I remove trailer pump pipe removal when gas leakage leakage is also pulled loose understood
The trailer is driving the parking brake brake brake brake cabin air supply cabin parking two class cabin has a top gas supply brake brake when the gas leakage slowly no parking brake cabin no gas brake cabin there is no gas parking brake spring will top out against the top rod is not in time turn not gas
Tractor and trailer parking brake in the same way, the front of the car is parked in the car, brake cabin, air supply brake, brake cabin gas supply, parking, two gas tanks are not gas
