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ON Air Brake Test 7

  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
  • Based on 2024 ON commercial driver's licence manual
  • Updated for July 2024
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
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ON commercial driver's licence
5 out of 5,
1 votes
What you need to know
Welcome to Ontario Commercial Air Brake Test 7. This exam is specifically designed to prep you on brake adjustments and repair. With 50 questions, we've covered everything you'll need to know to make sure you're ready for the real test. Conquer the exam with ease by practicing today.
What to expect on the official exam



correct answers to pass


passing score

More 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 Test 8
  56. Class F Licence Marathon
  57. Class F Licence Exam Simulator
  58. Air Brake Test 1
  59. Air Brake Test 2
  60. Air Brake Test 3
  61. Air Brake Test 4
  62. Air Brake Test 5
  63. Air Brake Test 6
  64. Air Brake Test 7 (you are here)
  65. Air Brake Test 8
  66. Air Brake Test 9
  67. Air Brake Test 10
  68. Air Brake Test 11
  69. Air Brake Test 12
  70. Air Brake Test 13
  71. Air Brake Test 14
  72. Air Brake Marathon
  73. Air Brake Exam Simulator
  74. AZ Licence Exam Simulator
List of questions (classic view)
  1. How many different types of air brake chambers are typically used in vehicles?
  2. What is pushed out of the brake chamber to apply the foundation brake?
  3. At what pressure do air brake system safety valves typically open?
  4. How are the separate brake systems for normal stopping and for parking and emergency braking in vehicles with air brakes controlled?
  5. What determines the pushrod stroke in an air brake system?
  6. Air pressure gauges indicate the air pressure in
  7. How do does a spring brake apply the brakes?
  8. What is the name of the flexible rubber disc contained within a service brake chamber?
  9. What contains the brake drum or disc in a vehicle brake system?
  10. Due to their design, do air brake chambers each have a maximum pushrod stroke-length limit?
  11. What does compressed air leaving the vehicle's systems not carry with it?
  12. What connects the brake chamber to the brake assembly in an air brake system?
  13. What is meant by 'pushrod stroke length' in an air brake system?
  14. What is a brake chamber that includes both service brake and spring brake sections called?
  15. Some vehicles may have an alternate device that provides a low-pressure warning. What is this system known as?
  16. Who is permitted to perform brake readjustments on both manual and automatic slack adjusters?
  17. How are spring brakes activated?
  18. Compressed air can be exhausted from which of the following locations?
  19. The low-pressure warning device must activate before the pressure in either tank drops below what level?
  20. A front-wheel limiting valve
  21. Which of the following statements is false? You can compare the length of the pushrod stroke to the prescribed adjustment limits based on...
  22. A spring brake control valve is normally a push/pull type valve fitted with a yellow, four-sided knob located on the dashboard. To apply the spring brakes, you usually
  23. What holds most brake chambers of today's commercial vehicles together?
  24. Why is a hand valve often fitted on the instrument panel or steering column of a towing vehicle?
  25. If the spring brakes activated because of loss of air pressure, caging each spring brake will
  26. If the air lines from the tractor to the trailer are cross-connected, what may happen?
  27. The air line that carries air to fill the trailer's tanks is usually called
  28. The air line that carries air pressure for the trailer service brakes is usually coloured
  29. The air line that carries air to fill the trailer air tanks is usually coloured
  30. What additional components are required in vehicles designed to tow trailers?
  31. To release a DD3 Safety Actuator brake, operate the parking brake control valve and then press the brake pedal for
  32. How can you identify a disabled or caged spring brake chamber?
  33. What function does a tractor parking-brake control valve perform?
  34. On what does the effectiveness of a vehicle's spring brakes depend?
  35. Some buses and motor coaches have a different type of parking and emergency brake that does not use a large spring in the brake chamber. What is this chamber called?
  36. What is the term for the trailer connection carrying pressure for the service brakes?
  37. What is another term for the couplers used to connect a trailer?
  38. Can spring brakes stop or hold a vehicle if the brakes are out of adjustment?
  39. How much air pressure is required to compress the spring in a spring brake chamber to release it?
  40. What is required of each trailer coupler?
  41. A tractor parking-brake control valve is typically what?
  42. A tractor can pull more than one trailer. When trailers are coupled to each other, the air lines must be connected too. To prevent air loss from these lines when they are not in use, the lines are usually equipped with
  43. What can cause an unexpected vehicle stop due to sudden automatic application of the spring brakes?
  44. In a tractor-trailer, if the hand valve and brake pedal are applied at the same time, which brakes get the higher air pressure?
  45. Compressing the spring in a spring brake chamber in order to release the spring brake is known as
  46. What is the consequence if you fail to close the trailer supply valve when no trailer is attached?
  47. What are the receptacles on most towing vehicles called that protect them from dirt and water when not in use?
  48. The brake system of ________ that attaches one trailer to another is essentially the same as a trailer system.
  49. What is the function of the tractor protection valve?
  50. What can a technician use to manually compress the spring in a spring brake chamber?