Air Brakes Written Test

Question 1

5. If your vehicle has an alcohol evaporator, it is there to?

Answer 1

D. Reduces the risk of ice in the air brake valves in cold weather.

Question 2

6. Oil and water usually collect in compressed air tanks, if you don’t have the automatic tank drains, when should you drain the air tanks?

Answer 2

B. After every working day.

Question 3

8. If your vehicle is equipped with an alcohol evaporator, every day during cold weather, you should?

Answer 3

A. Check and fill the alcohol level.

Question 4

9. Which of the following is okay to find in the air brake system?
A. Oil
B. Air
C. Water
D. All of the above

Answer 4

D. All of the above

Question 5

10. Why drain water from compressed air tanks?

Answer 5

B. Water can freeze in cold weather and cause brake failure.

Question 6

11. The most common type of foundation brake on heavy commercial vehicles is?

Answer 6

C. S-cam drum.

Question 7

13. When using the parking brake or emergency brake, what type of pressure is being used?

Answer 7

B. Spring pressure.

Question 8

15. The ABS malfunction lamp color is?

Answer 8

C. Yellow

Question 9

17. The vehicle must have a warning device, which comes on before the air pressure in the service air tank falls below?

Answer 9

C. 60 psi

Question 10

18. What is the only legal type of mechanism for the parking/emergency brake?

Answer 10

B. Spring pressure

Question 11

19. What turns on the electrical stop light switch in an air brake system?

Answer 11

C. Air pressure

Question 12

21. What determines how effective the spring emergency brakes/parking brakes are working?

Answer 12

C. Depends on the adjustment of the service brakes

Question 13

22. If your Truck has a dual parking control valve, you can use pressure from a separate tank to?

Answer 13

A. Release the Emergency brakes to move a short distance.

Question 14

23. Your vehicle has a dual air brake system, if a low warning pressure comes on for the secondary system, you should?

Answer 14

A. Stop, safely park, and continue only when the system is repaired.

Question 15

24. What’s the first thing to do when the low air pressure warning comes on is?

Answer 15

A. Stop and safely park as soon as you can.

Question 16

25. When does the Drivers Manual advise disconnecting the steering axle brakes to help keep the unit straight?

Answer 16

B. Never

Question 17

27. On a heavy vehicle, the emergency brake is usually held in place by spring pressure because air pressure can leak away?
    T/F?

Answer 17

A. True

Question 18

30. During normal driving, parking/emergency brakes are held back by?

Answer 18

B. Air pressure

Question 19

(Test #2)

1. How do you check the free-play on manual slack adjusters?

Answer 19

B.

• Park on level ground,
• chock the wheels,
• release parking brakes,
• pull slack adjuster.

Question 20

2. The air leakage rate for a combinatioon vehicle (engine off, brakes on) should be less than ______ psi per minute?

Answer 20

D. 4 psi

Question 21

3. With the engine off, and the brakes released, a combination vehicle air brake system should not leak more than how many psi per minute?

Answer 21

C. 3 psi

Question 22

4. A straight truck or bus air brake system cannot leak more than ____ psi per minute with engine off/brakes released?

Answer 22

B. 2 psi

Question 23

5. Air loss in a straight vehicle (not combination unit) should not be more than _______ psi with the engine off and the brakes on?

Answer 23

D. 3 psi in 60 seconds

Question 24

7. You must make a quick emergency stop, you should brake as you?

Answer 24

C. Stay in a straight line and maintain steering control.

Question 25

10. Why should you NOT fan your brakes on and off during long downgrades?

Answer 25

C. Does not allow brakes to cool off.

Question 26

11. Air braking takes more time than hydraulic braking because air?

Answer 26

B. Takes more time to flow through the lines than hydraulic.

Question 27

12. Which of the following makes total stopping distance for air brakes longer than that for hydraulic brakes?
    A. perception distance
    B. reaction difference
    C. brake lag distance

Answer 27

C. brake lag distance

Question 28

13. The brake system that applies and releases the brakes when the driver uses the brake pedal is the _______ brake system?

Answer 28

Service brake system

Question 29

14. The driver must be able to see a warning that is given when air pressure in the service air tanks falls below?

Answer 29

60 psi

Question 30

15. An air brake system safety relief valve opens at about?

Answer 30

150 psi

Question 31

17. Your safety relief valve has opened several times, this means?

Answer 31

The system needs immediate attention

Question 32

18. At what air pressure should the low air warning alarm come on?

Answer 32

Must come on by 60 psi

Question 33

19. With the brakes released on a single (non-combination) vehicle, what is the allowable air loss?

Answer 33

2 psi

Question 34

To test the compressor on a dual air brake vehicle, run the engine at a fast idle to charge the air system, your gauge should show you?

Answer 34

your pressure builds from 85 - 100 psi within 45 seconds

Question 35

24. What would cause ALL of the air brake systems on a vehicle to have poor braking power?

Answer 35

Brakes out of adjustment

Question 36

27. When only the tractor is equipped with ABS, you should be able to?

Answer 36

Maintain control in a skid