Before a drive, ensure that air flows to all trailers by:

Combination Vehiclesmedium

AChecking the dashboard gauges

BOpening the rear shut-off valves and listening for escaping air

CInspecting the hoses

Detailed Explanation

The correct answer is "Opening the rear shut-off valves and listening for escaping air". This is based on federal CDL regulations and safety standards.

Correct Answer: Opening the rear shut-off valves and listening for escaping air

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Before a drive, ensure that air flows to all trailers by:

Detailed Explanation

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