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  • Updated for December 2024
  • Based on 2024 DE commercial driver's license manual

Free Delaware CDL Air Brakes Test 2024

This practice test will help you prepare for the real DMV qualification to drive a vehicle with air brakes and help you to become a better driver starting today.

The 30 multiple-choice questions is based directly on the Delaware Commercial Driver License Manual and applicable Delaware laws. You should also pay attention to the hint and explanation provided with each question, as these will make you more prepared for your actual exam. Practice as often as necessary until you achieve a passing score and feel comfortable with the information. Good luck, keep practicing, and drive safely!

  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements

What you need to know

4.38 out of 5 • 8 votes
9 min to complete
Available in EN and ES
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.

What to expect on the actual DE DMV exam

25

questions

20

correct answers to pass

80%

passing score

List of questions (classic view)

  1. At what measurement is the safety valve USUALLY set to open?
  2. The tractor protection valve
  3. Which of the following is NOT part of the drum brake?
  4. Which of the following are true about a dual air brake system?
  5. Which vehicles must have low air pressure warning signals?
  6. An antilock braking system (ABS)
  7. Which of the following can cause brakes to fade or fail?
  8. When should you use the parking brake?
  9. Which of the following should you do before leaving your vehicle unattended?
  10. How would you check your truck's slack adjusters?
  11. What is the best way to test your vehicle's low air pressure warning signal?
  12. The purpose of a supply pressure gauge is
  13. How do brakes work on a long, steep downgrade?
  14. Which of the following is NOT part of the air brake system?
  15. Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
  16. Why must you pass a knowledge test on air brakes?
  17. Spring brakes are
  18. After the initial pressure drop, the maximum acceptable leakage rates per minute are
  19. If the air tanks are not drained,
  20. Which of the following is NOT part of the braking process when you're driving a tractor-trailer with an antilock braking system (ABS)?
  21. What is the best way to test if your vehicle's spring brakes come on automatically?
  22. How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
  23. Slack adjusters are
  24. Under which conditions are front wheel brakes good to use?
  25. When should you drain your air tanks?
  26. The low air pressure warning signal will come on before the pressure in the air tanks falls below
  27. A low pressure warning signal is required on
  28. All vehicles equipped with air brakes have
  29. With air brake-equipped vehicles, the parking brakes should be used
  30. The use of air brakes on a downgrade is only a supplement to the
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