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Michigan CDL Permit Test - Air Brakes

Number of questions: 25
Passing score: 20
Directions: This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Michigan Commercial Driver License Manual. Questions come from the chapter covering: Air Brakes. The Air Brakes endorsement may be used with the Class A, B or C CDL.
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Passing grade —
5 or fewer errors
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1.
What kind of brakes do most newer heavy-duty trucks use?
Single air brakes
Dual air brakes
Triple air brakes
2.
What should happen before the air pressure in an air brake system tank falls below 55 psi?
The warning light should activate.
The vehicle will be unable to shift out of gear.
The front lights should flash.
3.
The ____ are activated by an electric switch that is triggered by the brake pedal.
Headlights
Turn signals
Brake lights
4.
When stopping in an emergency situation, you should:
Veer your trailer to the right and stop.
Stop in a straight line.
Veer your trailer to the left and stop.
5.
An application pressure gauge shows:
How much air pressure is being applied to the brakes.
How much air pressure is available.
How much air pressure is required to stop a vehicle.
6.
Friction in an S-cam brake is caused when the brake shoes and linings:
Press against the outside of the brake drum.
Press against the inside of the brake drum.
Push against each other.
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