Illinois CDL Practice Test 2

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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