Answer :
Final answer:
A tractor protection valve, which manages air pressure between a truck and its trailer, is deemed defective if air exhausts from the trailer supply line when the trailer supply valve is closed and the brake pedal is pressed.
Explanation:
A tractor protection valve is in charge of managing the air pressure between a truck (tractor) and its trailer. It is designed to prevent the tractor's air supply from draining out in the event that the trailer becomes disconnected or develops a significant leak in its brake system.
The correct answer to this question is Option 2: the trailer supply line with the brake pedal pressed. A tractor protection valve is assumed to be defective if, when the trailer supply valve is closed (pulled out), air exhausts from the trailer supply line when the brake pedal is pressed. This is because the tractor protection valve should prevent air loss under these conditions, suggesting a problem if it doesn't.
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