2026 New Mexico Doubles - Triples CDL Practice Test 1

In order, the four steps to test your trailer's service brakes are as follows

Check for normal air pressure. Release the parking brakes. Pull forward slowly. Apply the trailer brakes, using the hand control if so equipped. Apply the trailer brakes, using the hand control if so equipped. Release the trailer's parking brakes. Check for normal air pressure. Pull forward slowly. Check for normal air pressure. Release the parking brakes. Apply the trailer brakes, using the hand control if so equipped. Step off the brakes and pull forward slowly.

Correct Answer:

Check for normal air pressure. Release the parking brakes. Pull forward slowly. Apply the trailer brakes, using the hand control if so equipped.

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