Answer :
Final answer:
When the service line disconnects while driving, the trailer brakes will engage automatically as a safety measure to prevent uncontrolled movement of the trailer. The correct option is b) The trailer brakes will engage.
Explanation:
If the service line disconnects while you are driving, the trailer brakes will engage right away. This is a safety measure designed to prevent the trailer from continuing to move uncontrollably in the event of a disconnection from the tractor. In braking systems, especially in heavy vehicles like trucks and trailers, the service line is part of the air brake system that controls the braking through air pressure. If this service line is disconnected, the loss of air pressure triggers the trailer's brakes to engage automatically, significantly reducing the risk of a runaway trailer situation.
