1. With dual air systems, the air pressure should build:
A From 85 to 100 psi in 45 seconds
B From 70 to 100 psi in 60 seconds
C From 85 to 150 psi in 45 seconds
D From 70 to 150 psi in 60 seconds

2. A fully charged air system typically has ____ psi:
A 100
B 125
C 150
D 175

3. To test air leakage rate you should:
A Leave the engine running and release the service brake
B Turn off the engine and release the service brake
C Charge the air system and leave the engine running
D Depress the brake pedal and monitor the air pressure gauge

4. A combination vehicle air brake system should not lose air faster than:
A 2 psi per minute
B 3 psi per 30 seconds
C 3 psi per minute
D 4 psi per minute

5. To check the air compressor governor "cut in" and "cut out" pressures:
A Run the engine at a fast idle
B Step on and off the brake to reduce tank pressure
C Monitor the air pressure gauge
D All of the above

6. To test your service brakes you should:
A Stop the vehicle and put the parking brake on
B Release the parking brake, move forward slowly and depress brakes
C Put parking brake on and release air pressure
D Depress brakes when traveling at highway speeds

7. Stab braking occurs when you:
A Press on the brake pedal as hard as you can
B Release the brakes when the wheels lock up
C Apply the brakes when the wheels start rolling
D All of the above

8. Air brakes take longer to stop than hydraulic brakes because:
A The reaction time is longer for the driver
B It takes longer for the air to flow through the lines
C The linings get hotter more quickly
D None of the above

9. The proper way to go down long grades is to:
A Use a low gear and push hard on the brakes
B Let up on the brakes from time to time to cool them
C Use a low gear and apply light pressure on the brakes
D Brake on and off down the hill

10. You should use the parking brake:
A Only on steep hills
B On level surfaces
C Any time you park
D When the brakes are hot

Score =
Correct answers:

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