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Commercial Driver’s License (CDL) Exam Endorsement Test: The Air Brakes Test
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Avg score: 55% • Most missed: “The low-air-pressure warning light must come on before the air pressure in the t…”
Commercial Driver’s License (CDL) Exam Endorsement Test: The Air Brakes Test
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25 Questions

1. What should you do if the low-air-pressure warning comes on
2. What protects the tank and the rest of the air system from too much pressure
3. Air brake systems are three braking systems combined. They are
4. The braking power of spring brakes depends on
5. In checking that the spring brakes come on automatically, you should not
6. The most common foundation brake is the
7. You are driving a vehicle at 55 mph on dry pavement under good traction and brake conditions. What is the approximate total stopping distance needed to bring your vehicle to a complete stop
8. How often should you drain your air tanks
9. During the walkaround inspection, if a slack adjuster moves slightly more than an inch where the push rod attaches to it, then
10. Which of the following pumps air into the air storage tanks
11. Which of the following is a proper technique in using controlled braking
12. When braking on downgrades,
13. Why, on long downhill grades, do experts recommend using a low gear and light steady pressure instead of on-again, off-again braking
14. Which of the following tells you how much pressure there is in the air tanks
15. Which of the following statements is true
16. The low-air-pressure warning light must come on before the air pressure in the tanks falls below what psi level
17. The main purpose of the alcohol evaporator is to
18. If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
19. The brake system that applies and releases the brakes when the driver uses the brake pedal is the _________________________ brake system.
20. Before driving a vehicle with a dual air system, allow time for the air compressor to build up to 100 psi pressure in which of the following
21. Most newer heavy-duty vehicles use dual air brake systems for safety. A dual air brake system has
22. Air brakes use
23. Foundation brakes are used
24. During walkaround inspections of your vehicle, which parts of the air brake system should be checked
25. Pressing and releasing the brake pedal quickly and repeatedly

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