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FREE 2024 North Carolina (NC) Air Brakes Quick Review 2

2024 NC Air Brakes Information

Most commercial vehicles utilize an air brake system over the traditional hydraulic brake system of passenger cars due to the "unlimited" supply the included air compressor and storage tanks can create. This eliminates the need to add hydraulic fluid when connecting a trailer.

The air brakes test covers the air brake system in detail, including appropriate air loss, brake lag, system components, and more. There are a total of 25 multiple choice questions on the air brakes exam, and you must score 80% (20 out of 25) to pass the exam. We have complied 100 questions you will find on the air brakes exam. These questions are based off the 2024 North Carolina CDL drivers’ manual.

The air brakes exam is different than the other endorsement tests, it actually serves as a restriction on your license. You are able to get a CDL without the air brakes test but will not be allowed to drive any vehicle that is equipped with air brakes because your license will have a "L" restriction.

Image of North Carolina's Driver's License

Based on the 2024 NC CDL Driver's Manual

NC Air Brakes Fact Sheet
Questions on Test:
25
Correct answers needed to pass:
20
Passing Score:
80%
Age to apply:
18
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The air compressor governor controls:

Possible Answers:

The speed of the air compressor.
Air pressure applied to the brakes.
When air is pumped into the air tanks.
Answer:
When air is pumped into the air tanks.
Explanation:
The governor controls when the air compressor will pump air into the air storage tanks. When air tank pressure rises to the "cut-out" level around 125 psi, the governor stops the compressor from pumping air. When the tank pressure falls to the "cut-in" pressure around 100 psi, the governor allows the compressor to start pumping again.
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  1. The air compressor governor controls:
  2. Of the choices below, the first thing to do when a low air pressure warning comes on is:
  3. Air brake equipped vehicles must have:
  4. Modern air brake systems combines three different systems. They are the service brakes, the parking brakes and the:
  5. If you must make an emergency stop, you should brake so that you:
  6. The driver must be able to see a warning that is given before air pressure in the service air tanks falls below:
  7. The most common type of foundation brakes found on heavy vehicles is the:
  8. When driving down a long steep hill you should:
  9. The modulating control valve is?
  10. Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
  11. Which of the following is not part of the braking process when you're driving a tractor-trailer combination vehicle with an antilock braking system (ABS)?
  12. Which of the following are true about a dual air brake system?
  13. How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
  14. Spring brakes are
  15. In the event of a brake system failure, the emergency brake system uses __________ to stop the vehicle.
  16. Repeatedly pressing and releasing (fanning) the brake pedal may result in
  17. If the spring brakes are on, when should you push the brake pedal?
  18. You'll know that your brakes are fading if
  19. A converter dolly with antilock brakes (ABS) is required to have
  20. Which of the following is the most important thing about hard braking?
  21. In controlled braking, you
  22. If oil and water collects in the air tanks, what could happen to the brakes?
  23. S-cam drum brakes have an S-cam in each brake chamber. Why is it called an "S-cam?"
  24. To test the air service brakes,
  25. When can you leave your truck unattended without first applying the parking brakes or chocking the wheels?
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