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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. Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______________ distance
3. If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
4. Pressing and releasing the brake pedal quickly and repeatedly
5. The main purpose of the alcohol evaporator is to
6. Air brake systems are three braking systems combined. They are
7. How often should you drain your air tanks
8. Spring brakes do which of the following
9. During walkaround inspections of your vehicle, which parts of the air brake system should be checked
10. The low-air-pressure warning light must come on before the air pressure in the tanks falls below what psi level
11. The brake system that applies and releases the brakes when the driver uses the brake pedal is the _________________________ brake system.
12. Which of the following pumps air into the air storage tanks
13. 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
14. 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
15. When should you NOT use the parking brakes
16. What protects the tank and the rest of the air system from too much pressure
17. The most common foundation brake is the
18. Foundation brakes are used
19. Which of the following statements is true
20. The braking power of spring brakes depends on
21. Most newer heavy-duty vehicles use dual air brake systems for safety. A dual air brake system has
22. Why, on long downhill grades, do experts recommend using a low gear and light steady pressure instead of on-again, off-again braking
23. Air brakes use
24. When braking on downgrades,
25. During the walkaround inspection, if a slack adjuster moves slightly more than an inch where the push rod attaches to it, then

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