What Does The Blue Service Line Do - The service line is connected to the trailer with. Carries air from the foot service brake, carries air from the hand service brake. Sometimes, metal tags are attached to the lines with. Web the service line is the blue line that runs between the trailer and the tractor. Web the service line (also called the “control line” or “signal line”) carries air controlled by the foot brake or the trailer hand brake. Web what does the blue service line do? Web blue is used for the service lines and red for the emergency (supply) lines.
Web what does the blue service line do? The service line is connected to the trailer with. Sometimes, metal tags are attached to the lines with. Web blue is used for the service lines and red for the emergency (supply) lines. Web the service line (also called the “control line” or “signal line”) carries air controlled by the foot brake or the trailer hand brake. Web the service line is the blue line that runs between the trailer and the tractor. Carries air from the foot service brake, carries air from the hand service brake.