CDL Air Brakes Test

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1. If your truck has a properly functioning dual air brake system and minimum size air tanks the air pressure should build up from 85 to 100 psi within how many seconds?
2. The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
3. The most common type of foundation brake found on heavy vehicles is the:
4. All air brake equipped vehicles have:
5. The S-Cam:
6. Repeatedly partially releasing and pressing the brake pedal may result in:
7. The use of brakes on a long and steep downgrade under normal conditions is only supplement to:
8. To check the free play of manual slack adjusters of S-Cam brakes, you should park on:
9. Excessive use of the service brakes results in overheating which can lead to:
10. In ideal conditions a truck or bus with an air brake going at 55 mph would require stopping distance of how many feet?
11. The brake system that applies and releases the brakes when the driveer uses the brake pedal is the _______ brake system
12. The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more thanL
13. It is accepted that too much heat caused by using your brakes too often can also cause:
14. During normal driving, spring brakes are usually held back by:
15. Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
16. Air braking takes more time than hydraulic braking because air:
17. The air compressor governor controls:
18. Your truck or your bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
19. Your truck has a dual air system and one of the system loses its pressure. What will happen?
20. The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below____psi

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