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EXAM REVIEW
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Free Colorado DMV Combination Class A Test 1
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Question Number 20
20. Before a drive, ensure that air flows to all trailers by:
Opening the rear shut-off valves and listening for escaping air.
Closing the rear shut-off valves and listening for escaping air.
Disconnecting air supply lines and listening for escaping air.
Rolling each trailer down a hill and testing the brakes.
✔ Correct Answer:
Opening the rear shut-off valves and listening for escaping air.
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