Air Brakes Test

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Air Brakes Test

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1. Modern air brake systems combine three different systems. The systems are the service, parking, and _____brake systems

A. Emergency

B. Foot

Drum

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2. The driver must be able to see a warning before air pressure in the service tanks fall below ___psi

A. 40

B. 60

C. 80

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3. The brake pedal in an air brake system:

A. Controls the speed of the air compressor

B. Always needs to be held down halfway during normal driving

C. Controls the air pressure applied to the brakes

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4. Air braking takes more time than hydraulic braking because air:

A. Brakes use different brake drums

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

C. Is always leaking through air line fittings.

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5. If your vehicle has a alcohol evaporator, it is there to:

A. Rid the wet tank of alcohol that condenses and sits at the bottom

B. Eliminate the need for daily tank draining

C. Reduce the risk of ice in air brake valves in cold weather

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6. If your truck has dual parking control valves, you can use pressure from a separate tank to:

A. Release the spring emergency parking brakes to move a short distance

B. Apply more brake pressure if the main tank is getting low

C. Stay parked twice as long with your service air pressure.

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7. To check the free play of manual slack adjusters on s-cam brakes, you should park on

A. Level ground with the parking brake on

B. Level ground, chock the wheels, and turn off the parking brakes

C. Level ground and drain off air pressure before adjusting.

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8. Of the choices below, the first thing to do when a low air pressure warning light comes on is:

A. Stop and safely park as soon as possible

B. Shift to the next higher gear

C. Open the air supply control valve

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9. The air compressor governor controls:

A. When the chambers release the pressure

B. Air pressure applied to the brakes

C. When air is pumped into the air tanks

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10. The braking power of the spring brakes:

A. Is not affected by the condition of the service brakes

B. Can only be tested by highly trained brake service people

C. Depends on whether the service brakes are in adjustment

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11. All vehicles equipped with air brakes have:

A. A hydraulic system, in case the air system fails.

B. A supply pressure gauge

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12. If you must make a emergency stop, brake so you:

A. Use the full power of the brakes and lock them.

B. Can steer and your vehicle stays in a straight line

C. Use the hand brake first

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13. If you don’t have automatic tank drains, how often should you drain the oil and water from the bottom of the compressed air storage tanks?

A. At the end of each day of driving

B. Weekly

C. Periodically

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

A. Have used in this trip

B. Have in the air tanks

C. Are applying to the brakes

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15. Your brakes are fading when

A. You have to push harder on the brake pedal to control your speed on a downgrade

B. The brake pedal feels spongy when you apply pressure

C. You release pressure on the brake pedal and speed increases.

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16. If your vehicle has an alcohol evaporator, everyday during cold weather you should:

A. Check alcohol level and fill the evaporator if needed

B. Change the evaporator

C. Clean the air filter with alcohol

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17. Why should you drain water from compressed air tanks?

A. The low boiling point of water reduces braking power

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

C. To keep the air compressor oil clean

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18. Your vehicle has a dual air brake system. If the low air pressure warning comes on for the secondary system, you should:

A. Bring the vehicle to a safe stop and continue only when the system is fixed.

B. Reduce your speed, and test the remaining system why driving

C. Reduce your speed, and drive to the nearest garage for repairs.

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

A. Bolts or clamps

B. Air pressure

C. Spring pressure

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20. In air brake vehicles, the parking brakes should be used

A. As little as possible

B. Any time the vehicle is parked

C. To hold your speed when going downhill

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21. Emergency stab braking is when you

A. Press hard on the brake pedal and apply hand valve fully until you stop.

B. Apply the hand valve for one second, then push hard on the pedal

C. Brake as hard as you can, release the brake when the wheels lock, then put the brakes on again when the wheels start rolling.

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22. A straight truck air brake system should not leak at a rate more than___ psi per minute with the engine off and the brakes released.

A. 6

B. 4

C. 2

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23. The air loss rate for a straight truck with the engine off and the brakes on should not be more than

A. 1 psi in 30 seconds

B. 2 psi in 45 seconds

C. 3 psi in one minute

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23. The air loss rate for a straight truck with the engine off and the brakes on should not be more than

A. 1 psi in 30 seconds

B. 2 psi in 45 seconds

C. 3 psi in one minute

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24. The supply pressure gauge shows how much pressure

A. You have used in this trip

B. Is in the air tanks

C. Is going to the brake chambers

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

A. Service

B. Parking

C. Drum

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26. Before driving a vehicle with a dual air system, allow time for the air compressor to build up to a minimum of ______ psi pressure in both primary and secondary systems.

A. 25

B. 50

C. 100

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

A. Perception

B. Reaction

C. Brake lag

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

A. Disc brake

B. Wedge drum brake

C. S-cam drum brake

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29. Which of the following makes total stopping distance longer for air brakes than for hydraulic brakes:

A. Brake lag

B. Perception distance

C. Reaction time distance

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30. If the air compressor develops a leak, what keeps the air in the tanks?

A. The one-way check valve

B. The emergency relay valve

C. The tractor protective valve

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