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24 Cards in this Set

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1. All vehicles with air brakes must have a low air pressure warning signal.

True.

2. The air compressor is connected to the engine through gears or a v-belt.

True.

3. What does the air compressor do?

The air compressor pumps air into the air storage tanks.

4. Which kind of braking system is the air brake system?
A service brake system. A parking brake system. An emergency brake system. All of the above.

5. The emergency brake system uses parts of the service and parking brake systems to stop the vehicle in a brake system failure.

True.
6. How often should you drain air tanks?
Drain your air tanks at the end of each working day.
7. Which of the following formulas is true for vehicles with air brakes?
Perception Distance + Reaction Distance + Brake Lag Distance + Braking Distance = Total Stopping Distance
8. What does the air compressor governor do?
The governor controls when the air compressor will pump air into the air storage tanks.

9. When testing the low pressure warning signal, turn the electrical power on and step on and off the brake pedal to reduce air tank pressure. The low air pressure warning signal must come on before the pressure drops to less than ____ psi in the air tank.

60
10. The use of brakes on a long steep downgrade is only a supplement to the braking effect of the engine.
True
11. What is a supply pressure gauge used for?
These gauges tell you how much pressure is in the air tanks.

12. The air tanks do not hold enough air to allow the brakes to be used several times, even if the compressor stops working.

False.

13. What does an alcohol evaporator do?

Helps prevent ice in the system.

14. The safety valve in an air tank is usually set to open and release air at 150 psi.

True.

15. If the air compressor has its own oil supply, you should check the oil level before driving.

True.

16. What are the maximum leakage rates for an air brake system?

The loss rate should be less than two psi in one minute for single vehicles and less than three psi in one minute for combination vehicles.

17. The safety relief valve protects the air tanks and the rest of the system from building too much pressure.

true.
18. All air brake systems have an alcohol evaporator to put alcohol into the air system.
False.
19. How can you check slack adjusters?
By pulling hard on each slack adjuster.

20. A slack adjuster is a lever that connects the brake chamber push rod with the return spring.

False.

21. Why must air tanks be drained?

To keep oil and water from building up in the tank.

22. Brakes can fade or fail from excessive heat caused by using them too much and not relying on the engine braking effect.

True.

23. Letting up on the brake pedal reduces the air pressure and releases the brakes.

True.

24. A supply pressure gauge indicates how much pressure is in the air lines.

False.