Quiz 3 - Air Brakes

1. The application pressure gauge shows how much air pressure you:

Have in the tanks.
Are applying to the brakes.
Have in a modulating control valve.

2. The spring brakes used on the chamber in a straight truck will bring you to a stop when air pressure drops below ______ psi.

20
60
100

3. Why drain water from compressed air tanks?

Water low boiling point reduces braking power.
Water can freeze in cold weather and cause brake failure.
Water cools the compressor too much.

4. Your truck has a dual air system and one of the system loses its pressure. What will happen?

Brake drums will not be fully pressurized.
The manual slack adjusters of the S-cam brakes will not be set properly.
Either the front or back will not be fully operational.

5. Parking or emergency brakes of trucks and buses can be legally held on by _____ pressure.

Spring
Air
Fluid

6. During normal driving, spring brakes are usually held back by:

Bolts or clamps
Air pressure
Spring pressure

7. The air compressor stops pumping air at what psi?

100
125
150

8. The most common type of foundation brake found on heavy vehicles is the:

Wedge drum
S-cam
Disc

9. If your vehicle has an alcohol evaporator, every day during cold weather you should:

Check and fill the alcohol level.
Change the alcohol from a new bottle.
Check the oil for alcohol content.

10. The braking power of the spring brakes:

Is not affected by the condition of the service brakes.
Depends on the service brakes being in adjustment.
Increases when the service brakes are hot.

11. Total stopping distance for air brakes is longer than that for hydraulic brakes due to _______ distance.

Brake lag
Reaction
Effective braking

12. Repeatedly partially releasing and pressing the brake pedal may result in:

A loss of brake air pressure
A build up of brake air pressure
No change of brake air pressure

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

Emergency
Service
Parking

14. An air brake system is fully charged at what psi?

75
100
125

15. The brake pedal in an air system:

Controls the speed of the air compressor.
Controls the air pressure applied to put on the brakes.
Is connected to slack adjusters by a series of rods and linkages.



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