Minnesota CDL Combination Test 2

In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:

Air pressure drops to a level between 20 and 45 psi. You are experiencing a trailer jackknife. Wheels have regained traction after a skid. Air pressure is above 45 psi.

Correct Answer:

Air pressure drops to a level between 20 and 45 psi.

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