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ON Air Brake Test 5 2024

4.5 out of 5 • 4 votes.
Based on 2024 ON commercial driver's license manual Instant feedback

If you’re looking for a job in the trucking industry, completing the mandatory commercial driver’s licence knowledge exam is the first step towards achieving your dream. We have developed this 50-question Air Brake practice test to help you prepare for the province’s examination (also known as the Ontario trucking exam). Regardless of your current level of knowledge, this test will help you brush up on some important rules. You will likely perform better on the written test if you have been studying for it, so this is why it is so important to maintain your studying regiment. Know the rules, and the road will be a much safer place. Scroll down to begin the test.

Ensuring the accuracy and quality of our practice tests is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article.

Perfect for:

  • First-time ON commercial license applicants
  • Existing commercial license holders adding endorsements
  • ON commercial license renewal applicants

What to expect on the actual ON commercial license exam:

  • 25 questions
  • 20 correct answers to pass
  • 80% passing score

More FREE ON Commercial Driving Resources:

  1. General Knowledge 1
  2. General Knowledge 2
  3. General Knowledge 3
  4. General Knowledge 4
  5. General Knowledge 5
  6. General Knowledge 6
  7. General Knowledge 7
  8. Road Signs
  9. Road Signs 2
  10. General Knowledge Marathon
  11. General Knowledge Exam Simulator
  12. Class A Licence Test 1
  13. Class A Licence Test 2
  14. Class A Licence Test 3
  15. Class A Licence Marathon
  16. Class A Licence Exam Simulator
  17. Class B Licence Test 1
  18. Class B Licence Test 2
  19. Class B Licence Test 3
  20. Class B Licence Test 4
  21. Class B Licence Test 5
  22. Class B Licence Test 6
  23. Class B Licence Test 7
  24. Class B Licence Test 8
  25. Class B Licence Test 9
  26. Class B Licence Test 10
  27. Class B Licence Test 11
  28. Class B Licence Marathon
  29. Class B Licence Exam Simulator
  30. Class C Licence Test 1
  31. Class C Licence Test 2
  32. Class C Licence Test 3
  33. Class C Licence Test 4
  34. Class C Licence Test 5
  35. Class C Licence Test 6
  36. Class C Licence Test 7
  37. Class C Licence Test 8
  38. Class C Licence Test 9
  39. Class C Licence Test 10
  40. Class C Licence Test 11
  41. Class C Licence Marathon
  42. Class C Licence Exam Simulator
  43. Class D Licence Test 1
  44. Class D Licence Test 2
  45. Class D Licence Test 3
  46. Class D Licence Marathon
  47. Class D Licence Exam Simulator
  48. Class F Licence Test 1
  49. Class F Licence Test 2
  50. Class F Licence Test 3
  51. Class F Licence Test 4
  52. Class F Licence Test 5
  53. Class F Licence Test 6
  54. Class F Licence Test 7
  55. Class F Licence Marathon
  56. Class F Licence Exam Simulator
  57. Air Brake Test 1
  58. Air Brake Test 2
  59. Air Brake Test 3
  60. Air Brake Test 4
  61. Air Brake Test 5 (you are here)
  62. Air Brake Test 6
  63. Air Brake Test 7
  64. Air Brake Test 8
  65. Air Brake Test 9
  66. Air Brake Test 10
  67. Air Brake Test 11
  68. Air Brake Test 12
  69. Air Brake Test 13
  70. Air Brake Test 14
  71. Air Brake Marathon
  72. Air Brake Exam Simulator
  73. AZ Licence Exam Simulator

List of questions (classic view)

  1. Which of the following is an advantage of wedge brakes over S-cam drum brakes?
  2. Assuming good traction and constant vehicle speed, if you double your vehicle's weight, your vehicle's braking distance will be
  3. When inspecting air brakes, you should wear
  4. For inspecting the air brakes, when should you chock the wheels?
  5. How can manual slack adjusters be adjusted?
  6. How should you test the spring brakes?
  7. Brake chambers of size 36 are marked with
  8. __________________are conected to the brake spider in "S" cam brake system.
  9. Automatic slack adjusters must be inspected
  10. Which of the following is most likely to have air brakes?
  11. According to the Official Ontario Air Brake Manual, when testing a combination vehicle's spring brakes, you should at least test ________ if possible.
  12. An antilock braking system (ABS)
  13. What to do when low air warning device activates on the road?
  14. The spring brakes are for
  15. Who can adjust the air brakes?
  16. How can you make sure that each air tank is securely attached to the vehicle?
  17. What does caging a brake chamber do?
  18. On a tractor-trailer, the red dashboard knob controls the spring brakes on __________, and the yellow dashboard knob controls the spring brakes on _________.
  19. Brakes are designed to withstand temperatures of up to
  20. DD3 safety actuators are mostly found in
  21. Trailer hand valve located on the tractor dashboard used to apply
  22. Which of the following is not a part of a braking system?
  23. How many airlines go to DD3 safety actuator brake chamber?
  24. Easiest way to test trailer`s spring brakes is
  25. Which of the following is most likely to lead to brake fade?
  26. When inspecting the air brake chambers, what should you look for?
  27. Brake fade can lead to
  28. Under the Ontario Highway Traffic Act, how often must air brakes be inspected?
  29. To test the trailer's service brakes independently of the tractor's service brakes, what should you do?
  30. When inspecting the brake drums, you should look for
  31. Compared with the service tanks, how much moisture should the supply tank discharge?
  32. If the low air pressure warning activates, you should
  33. To inspect an air brake system, you should wear
  34. The best way to reduce rough and abrupt braking is to
  35. What are the service brakes used for?
  36. Manufacturers recommend draining moisture and oil in an air brake system on a _______ basis.
  37. What is the "cut-out" level?
  38. What happens to the foot valve when you press down on the brake pedal?
  39. Why is it important to know which parts of the air brake system exhaust air?
  40. Which of these can strain your vehicle's braking system?
  41. What powers the air compressor?
  42. Which of these can contaminate a brake system's air lines?
  43. What type of energy is generated when brakes stop a moving vehicle?
  44. Is it required to have an air brake endorsement on your licence to operate a vehicle with air-over-hydraulic brakes in Ontario?
  45. Who should validate abnormal pressure readings in an air brake system?
  46. Do you need an air brake endorsement on your driver's licence to operate a vehicle with air parking brakes?
  47. What is the potential outcome of a single defective brake?
  48. What does excessive heat in the brake pads not create?
  49. What is the brake assembly at each wheel called?
  50. When are air compressors designed to operate?