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Nebraska 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 two, three or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Nebraska 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 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.
2.
If the spring brakes are activated, you should never:
Push down the brake pedal.
Open the hood.
Release air from the air storage tanks.
Open the door to the cab.
3.
A tank endorsement is:
Only required when transporting gases.
Only required when transporting liquids.
Required to transport both liquids and gases.
Optional when transporting hazardous materials.
4.
An emergency brake must be controlled by:
Mechanical force.
Air pressure.
Gravity.
5.
If the low air pressure warning signal comes on in a vehicle with air brakes, the driver should:
Test the brakes while driving, but continue driving if nothing seems wrong.
Immediately stop driving.
Drive with the hazard lights activated.
6.
What should happen if the air pressure in the air brake system tanks falls below 60 psi?
A warning light should come on.
Lights should flash on the outside of the vehicle.
A message should appear on the control panel.
The vehicle should stop.
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