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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Nebraska CDL knowledge test. The NE CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Nebraska CDL Manual. Take this NE CDL practice test now to prepare for the actual air brakes test!
1. In newer vehicles with air brakes, you put on the parking brake:
moving the orange push-pull lever to the right.
using a diamond-shaped, yellow, push-pull control knob.
using a P-shaped, yellow control knob.
placing the transmission in Park.
2. A passive railroad crossing is one that:
does not have any type of traffic control device.
requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
has at least two traffic control devices installed at the crossing to regulate traffic.
has a traffic control device installed at the crossing to regulate traffic.
3. Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
30 to 35 psi.
5 to 15 psi.
55 to 74 psi.
20 to 45 psi.
4. To avoid becoming a distracted driver you should:
not engage in complex conversations with others.
not turn off all communication devices.
adjust all vehicle controls and mirrors while driving.
eat and drink while you drive.
5. You should drain the air tanks completely. If water and oil collect in the air tanks:
your brakes could become hard to press.
your brakes could fail.
your brakes could heat up.
None of the above.
6. Which of the following can cause brakes to fade or fail?
Brakes out of adjustment
Not relying on the engine braking effect
Excessive use of the service brakes
All of the above.
7. ABS:
allows you to brake harder.
replaces your normal brakes.
should only be used on dry roads.
is an addition to your normal brakes.
8. The stop light switch:
tells you when you need to use your parking brake instead of the service brake.
turns on the brake lights when you put on the air brakes.
should be used to fend off tailgaters.
warns you when the air supply pressure drops below 55 psi.
9. When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
left; right
left; left
right; right
right; left
10. When driving at night, you should:
drive slowly enough to see obstacles with your headlights.
look directly at the lights of oncoming vehicles.
put your own high beams on if other drivers don't put their low beams on.
use dark lenses if possible.
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NE CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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