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Montana 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. Each question has three or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Montana 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.
Most heavy-duty vehicles use:
Single air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.
2.
If a vehicle has air brakes, the air compressor drive belt should be checked before each drive. The belt should be:
Loosely attached.
Tight.
Cracked.
Frayed.
3.
A tank endorsement is:
Only required when transporting gases.
Only required when transporting liquids.
Used when transporting both liquids and gases.
Optional when transporting hazardous materials.
4.
What do air brakes use to make the brakes work?
Compressed air
Outside air
Non-compressed air
5.
What is brake lag?
The time required for the brakes to work after the brake pedal is pressed
The distance between the brake pedal and the floor
The amount of air pressure used to stop the vehicle
6.
What color light indicates a vehicle's ABS is not working?
Green
Blue
Yellow
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