2026 Montana Combination CDL Practice Test 2

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You are coupling a tractor and semi-trailer and have connected the air lines. Before backing under the trailer, you should:

Supply air to the trailer system, then pull out the trailer air supply knob to lock the trailer brakes Make sure that the trailer brakes are off Apply the service brakes twice to alert others

Correct Answer:

Supply air to the trailer system, then pull out the trailer air supply knob to lock the trailer brakes

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