Question 16 of 20
Score: 0/0If your test of the tractor protection valve is successful, what should happen?
ExplanationA proper test result means the tractor protection valve control will pop out or shift to the "emergency" position when air pressure falls, cutting off air to the trailer and applying the emergency brakes.
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Did you know? Coupling has a required order — chock, position, connect, check. The test grades the sequence.
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