Your Progress

  • 0 Incorrect (6 allowed to pass)
  • 0 Correct
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
  • 0 Incorrect (6 allowed to pass)
  • 0 Correct
Restart
 
 
 
 
 
Ask DMV Genie AI
new
Back to Program Home
  • Updated for December 2024
  • Based on 2024 OK commercial driver's license manual

Free Oklahoma CDL Air Brakes Test 2024

As an Oklahoma truck driver, the best CDL to build your career is one with the fewest amounts of restrictions, which means taking an exam to drive commercial vehicles with air brakes. To get a CDL with an air brakes qualification, practice exams are the key to a great score on the real exam. This 30 multiple-choice question quiz, with carefully written explanations based on exactly what the Oklahoma Driver License Manual’s writers state you must know, cover all the basics and then some about air brakes, so take it as many times as you need to get a perfect score, and you’ll be on your way to that less restricted CDL today!

Unlock full access with Premium
  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements

What you need to know

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 OK SOK exam

25

questions

20

correct answers to pass

80%

passing score

List of questions (classic view)

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

Your go-to, trusted source

Experience the Driving-Tests difference
Since our foundation in 2010, Driving-Tests.org has led the way in online driver's education, with over a decade of experience. Our dedicated experts, bringing together more than 50 years of collective expertise, have established us as the largest non-governmental organization in the U.S. solely focused on driver education. We go beyond the official manuals, offering unique interactive experiences and support like audio guides and an AI Assistant, to cater to different learning styles and needs.
Helping hundreds of thousands to ace their tests, our resources have earned a 4.7-star rating from over 14,500 reviews. Our goal is to make your path to becoming a confident driver as straightforward and effective as possible.