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  • Updated for January 2025
  • Based on 2025 GA commercial driver's license manual

Free Georgia CDL Air Brakes Test 2025

Whether driving through the foothills of Georgia’s Appalachian Mountains in the north, the Piedmont plateau in the south, or the hilly suburbs in the west, you’ll face a lot of steep hills, making the use of air brakes essential for control and safety. You’ve come to the right place for practice materials to prepare for the official {government-agency) air brakes knowledge test. If you don’t pass it, your CDL will include the restriction “L,” indicating that you’re not allowed to drive CMVs with air brakes. Since virtually all semi-trucks and tractor-trailers are equipped with air brakes, getting a Class A CDL without passing the test is a bit pointless. In fact, in Georgia, the air brakes qualification is a requirement of most companies due to how prevalent this braking system is, notably in Georgia’s agriculture, manufacturing, and transportation sectors.

Organizations in the Peach State that typically require drivers to have this qualification include trucking and logistics, charter bus services, and school transportation. The state has a strong trucking industry, with companies such as UPS and Saia headquartered in Georgia that require drivers to operate large freight vehicles equipped with air brakes. Charter bus services, including Southeastern Stages, based in Atlanta, require drivers with air brake qualifications. School buses in Georgiaare typically equipped with air brakes as well. With the “L” restriction prohibiting you from operating CMVs with air brakes, your job prospects would be severely limited.

The official {government-agency) test is divided into two parts: the skills test and the knowledge test. The skills test covers the parts of an air brake system, how to use them effectively, and air-brake inspection procedures. The skills test requires a hands-on inspection by identifying the brake system’s components, checking air pressure, testing for leaks, and operating a vehicle equipped with air brakes. The multiple-choice knowledge test contains questions on the concepts covered in the state’s CDL manual and requires a minimum score of 80% to pass.

We’ve carefully designed our Georgia CDL Air Brakes Practice Tests to align with the content covered in the official DDS knowledge test. With our practice test questions and answers provided in real time, you can learn the material efficiently and confidently. Once you feel prepared, simply schedule the knowledge test at the DDS, pay any fees, and take the test.

  • 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 GA DDS exam

25

questions

20

correct answers to pass

80%

passing score

List of questions (classic view)

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