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2026 Montana DMV Air Brakes Class B Test 1
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Question Number 9
9. Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when'':
Air pressure falls below 45 psi.
Air pressure falls below 20 psi.
Driving downhill.
Driving uphill.
✔ Correct Answer:
Air pressure falls below 45 psi.
Count Down:
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