CDL Combination Vehicle Test at Michigan 2025 – Test #3
The front trailer supports are up and the trailer is resting on the tractor. Make sure:
The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the ____ brake line.
Compared to a straight truck or bus there are _____ things to inspect in combination vehicle.
You have coupled with a semitrailer. Where should you out the iron trailer supports before driving away?
The air lines on a combination vehicle are often colored to prevent them from mixing up. The emergency line is ____, the service line is ____.
When checking the trailer emergency brakes the tractor protection control valve should be place in what position?
Michigan 2025 Commercial Driver's License computer test
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