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AB Air Brake Test 5

  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
  • Based on 2024 AB 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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AB commercial driver's licence
5 out of 5,
1 votes
What you need to know

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 Alberta 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.

What to expect on the official exam



correct answers to pass


passing score

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. Bobtail proportioning valves _________ when the tractor is bobtailed.
  6. How should you test the spring brakes?
  7. Brake chambers of size 36 are marked with
  8. In an S-cam drum braking system, the brake spider is connected to
  9. Automatic slack adjusters must be inspected
  10. Which of the following is most likely to have air brakes?
  11. Which of the following statements about auxiliary retarders are true?
  12. An antilock braking system (ABS)
  13. If the low air warning device activates while you're driving, what should you do?
  14. The spring brakes are for
  15. When draining the air tanks, you should drain the supply tank first. How can you tell which tank is the supply tank?
  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. The hand valve control applies
  22. Which of the following is not a part of a braking system?
  23. How many air lines must be connected to a DD3 safety actuator brake chamber?
  24. If 100 psi of air pressure is applied to a Type 30 brake chamber, what will the resulting pushrod force be?
  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. While you are driving a tractor-trailer, if the service line ruptures but the supply line remains intact, what will probably happen straight away?
  32. Compared with the service tanks, how much moisture should the supply tank discharge?
  33. If the low air pressure warning activates, you should
  34. To inspect an air brake system, you should wear
  35. The best way to reduce rough and abrupt braking is to
  36. What are the service brakes used for?
  37. Manufacturers recommend draining moisture and oil in an air brake system on a _______ basis.
  38. What is the "cut-out" level?
  39. What happens to the foot valve when you press down on the brake pedal?
  40. Why is it important to know which parts of the air brake system exhaust air?
  41. Which of these can strain your vehicle's braking system?
  42. What powers the air compressor?
  43. Which of these can contaminate a brake system's air lines?
  44. When is the right time to undertake the air brake knowledge test?
  45. Why do students perform air system pre-trips during the course?
  46. When are the practical exams conducted?
  47. Is it mandatory for drivers of two axle single motor vehicles registered as farm vehicles to have an air brake 'Q' endorsement?
  48. What is the minimum passing grade for the air brake knowledge test?
  49. What must be completed before moving on to the practical training sessions?
  50. What is the duration of the practical test?
  51. What increases the duration of air brake lag?