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FREE 2024 Alabama (AL) Air Brakes Practice Test 3

2024 AL Air Brakes Information

Most commercial vehicles utilize an air brake system over the traditional hydraulic brake system of passenger cars due to the "unlimited" supply the included air compressor and storage tanks can create. This eliminates the need to add hydraulic fluid when connecting a trailer.

The air brakes test covers the air brake system in detail, including appropriate air loss, brake lag, system components, and more. There are a total of 25 multiple choice questions on the air brakes exam, and you must score 80% (20 out of 25) to pass the exam. We have complied 100 questions you will find on the air brakes exam. These questions are based off the 2024 Alabama CDL drivers’ manual.

The air brakes exam is different than the other endorsement tests, it actually serves as a restriction on your license. You are able to get a CDL without the air brakes test but will not be allowed to drive any vehicle that is equipped with air brakes because your license will have a "L" restriction.

Image of Alabama's Driver's License

Based on the 2024 AL CDL Driver's Manual

AL Air Brakes Fact Sheet
Questions on Test:
25
Correct answers needed to pass:
20
Passing Score:
80%
Age to apply:
18
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If your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to:
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  1. If your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to:
  2. The brake pads should be _____ for the brakes to be on?
  3. You should know that your brakes are fading when:
  4. The application pressure gauge shows the driver how much pressure:
  5. If the air compressor should develop a leak, what keeps the air in the tanks?
  6. Why drain water from the compressed air tanks?
  7. During normal driving, spring brakes are usually held back by:
  8. Brake drums must not have cracks longer than _____ the width of the friction area?
  9. After the initial drop, the maximum acceptable leakage rates per minute are
  10. How do brakes work on a long, steep downgrade?
  11. How would you check your truck's slack adjusters?
  12. The parking brake control
  13. If the low air pressure warning signal is not working,
  14. Your vehicle has a dual air brake system. One of the systems loses air pressure. What will happen?
  15. Under ideal conditions, the average driver of a truck or bus equipped with air brakes and traveling at 55 mph would require what stopping distance?
  16. Modern air brake systems are three different systems combined: the service brakes, parking brakes, and _______ brakes.
  17. To check the free play of manual slack adjusters on S-cam brakes you should:
  18. Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
  19. If your vehicle has an alcohol evaporator, every day during cold weather you should:
  20. With S-cam drum brakes, when the brake chamber fills with air, air pressure pushes the push rod out, moving the ________ and thus rotating the ________.
  21. In which of the following situations should you NOT apply the parking brakes?
  22. Which of the following can cause brakes to fail or fade?
  23. If you need to stop quickly and your vehicle lacks antilock brakes, you can use
  24. Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of
  25. The modulating control valve allows you to control the
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