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BC Air Brake Test 11

  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
  • Based on 2024 BC commercial driver's licence manual
  • Updated for June 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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BC commercial driver's licence
5 out of 5,
1 votes

About this test

Navigating through the Rocky Mountains or along British Columbia's extensive coastline? You'll need a solid understanding of air brake systems. Use our 11th practice test with 50 questions to prepare for the official Air Brake test.

List of questions (classic view)

  1. Depending on the manufacturer, the angle between the centre of the slack adjuster arm and the brake chamber pushrod with the brakes applied is 90 degrees,
  2. What size hexagonal (hex) cap is found on slack adjusters with square adjusting bolts?
  3. You're adjusting an automatic slack adjuster that has a square adjusting bolt but doesn't have the round "button." You should first remove all of the following EXCEPT
  4. If you are checking and adjusting automatic slack adjusters and don't have an application pressure gauge, turn the engine off and step on and off the brake pedal to reduce air pressure to
  5. Why are manual adjustments of automatic slack adjusters considered to be dangerous?
  6. Is there still a need to routinely inspect automatic slack adjusters?
  7. How far should you back off the adjusting bolt to reinstate running clearance?
  8. How do pushrod strokes with automatic slack adjusters compare to well-adjusted manual slack adjusters?
  9. Do the brakes get adjusted correctly if a 90-degree angle is observed between the centre of the slack adjuster arm and the chamber pushrod when the brakes are applied?
  10. Certain parking brake control valves and trailer supply valves can stay open with a minimum of how much psi?
  11. Why is it suggested to have the service data books for the brand of automatic slack adjusters in your use?
  12. On vehicles with tandem axles, is it typical for the automatic slack adjusters on one axle to require a clockwise turn for adjustment while those on the other axle need a reverse direction?
  13. You're inspecting a standard Type 30 clamp type air chamber and an automatic slack adjuster. With the applied stroke method, at what length do pushrod measurements indicate a need for brake repair?
  14. If a slack adjuster has a hexagonal (six-sided) adjusting bolt, how should the brakes be adjusted?
  15. What is a key benefit of automatic slack adjusters?
  16. Today's trucks usually have large air reservoirs. Even if all brakes have excessive pushrod travel, the pressure drop won't exceed
  17. Is it against the law to retrofit manual slack adjusters on a vehicle originally manufactured with automatic slack adjusters?
  18. To bring a vehicle to a halt in the same distance when its weight has been doubled, the braking force should be what?
  19. What powers the compressor in a vehicle's air brake system?
  20. Where does a compressor pump the air in a vehicle's braking system?
  21. What is leveraged to gain a mechanical advantage in a braking system?
  22. What causes the wheels to stop spinning in a braking system?
  23. What could result from improperly adjusted brakes on one or two wheels of a vehicle?
  24. What influences the distance needed to bring a vehicle to a complete stop?
  25. What is the device that provides compressed air in a brake system known as?
  26. What is a common device used to obtain a mechanical advantage in braking systems?
  27. If a vehicle's compressor is belt-driven, what should you inspect the belts for?
  28. What term is used to denote air that has been forced into a smaller space?
  29. What is transmitted through an air brake system using compressed air?
  30. Where does the heat generated from the friction between brake drums and linings go?
  31. Which statement is untrue about the stopping distance?
  32. In an air brake system, what does the unloading stage signify?
  33. If a vehicle's speed is doubled, by how much must the braking force be increased to stop in the same distance?
  34. What is the optimal operating temperature for most brake linings?
  35. Approximately how long does it take from identifying a hazard to applying the brakes?
  36. What is the maximum operating temperature for most brake linings?
  37. Above what pressure will the compressor not have to pump air in the system?
  38. The compressor must start pumping air into the system by the time that air pressure falls to
  39. Which of the following is not one of the main components in a basic air brake system capable of stopping a vehicle?
  40. Overheating in brakes could lead to what adverse condition?
  41. When both the weight and speed of a vehicle are doubled, the braking force must be adjusted by what factor to stop in the same distance?
  42. What term is used to describe the time taken for air to travel through a properly maintained air brake system?
  43. When brakes generate heat, where does this heat eventually go?
  44. Which component controls when the compressor pumps air by monitoring the minimum and maximum air pressure in the system?
  45. What does the friction between brake drums and linings produce in a braking system?
  46. What is the determining factor for the amount of heat the brake drums can absorb?
  47. What does the term loading stage signify in an air brake system?
  48. Why is the sensation different when operating air treadles compared to hydraulic brakes?
  49. What is the consequence of not maintaining slack adjusters within their specified limits?
  50. What are the alternate names for the primary and secondary reservoirs in an air brake system?