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CDL > Air Brakes Test 1 > Flashcards

Air Brakes Test 1 Flashcards

1
Q

The service brake system applies and releases the brakes when you use the brake pedal during normal driving.

A

True.

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2
Q

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.

A

60.

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3
Q

The parking brake system applies and releases the parking brakes when you use the parking brake control.

A

True.

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4
Q

What can be done to help prevent oil and water from building up in the air tanks?

A

None of the above.

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5
Q

The air compressor governor controls when the air compressor will pump air into the brake safety valves.

A

False.

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6
Q

When the air tank pressure falls to around 100 psi, the governor allows the compressor to start pumping again.

A

True.

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7
Q

The air compressor pumps air into the air storage tanks.

A

True.

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8
Q

The air tanks do not hold enough air to use the brakes more than two times if the air compressor stops working.

A

False.

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9
Q

How often should you drain air tanks?

A

None of the above.

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10
Q

What does the (alcohol evaporator) help prevent?

A

None of the above.

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11
Q

When the air tank pressure falls to around 65 psi, the governor allows the compressor to start pumping again.

A

False.

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12
Q

A supply pressure gauge indicates how much pressure is in the brake chambers.

A

False.

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13
Q

The maximum leakage rates for an air brake system should be less than two psi in one minute for single vehicles, and less than three psi in one minute for combination vehicles.

A

True.

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14
Q

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

A

True.

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15
Q

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

A

True.

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16
Q

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

A

False.

17
Q

Only a certified mechanic can check slack adjusters.

A

False.

18
Q

Pressing and releasing the brake pedal rapidly can let air out faster than the air compressor can replace it.

A

True.

19
Q

Using the engine brake and not using the brakes often enough can cause the brakes to fade or fail?

A

False.

20
Q

Spring brakes are powerful springs that are held back by air pressure. If the air pressure is removed, the springs put on the brakes.

A

True.

21
Q

If the ABS is functioning properly, the ABS light on the dashboard will come on and stay on, if it does not stay on, the ABS is not working.

A

False.

22
Q

Pump the brake pedal to reduce the air tank pressure. The parking brake knob should pop out when the air pressure falls to the manufacturer’s specification. What air brake test is this?

A

This is how you check that the spring brakes will come on automatically.

23
Q

After the initial charging, the air compressor should start pumping at about 75 psi and stop at about 100 psi.

A

False.

24
Q

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

A

False.

25
Q

What is the maximum amount that the air pressure can drop in one minute during a Static Leakage Test?

A

Air pressure should drop no more than two psi for single vehicles, three psi for a combination of two vehicles, and five psi for a combination of three or more vehicles.

26
Q

What is the purpose of the air compressor?

A

The air compressor pumps air into the air storage tanks.

27
Q

All air brake systems have an alcohol evaporator so you can put alcohol into the air brake system.

A

False.

28
Q

What is the maximum amount that the air pressure can drop in one minute during an Applied Leakage Test?

A

Air pressure should drop no more than three psi for single vehicles, four psi for a combination of two vehicles, and six psi for a combination of three or more vehicles.

29
Q

Which of the following formulas is true for vehicles with air brakes?

A

Perception Distance + Reaction Distance + Brake Lag Distance + Braking Distance = Total Stopping Distance

30
Q

When air tank pressure rises to around 150 psi, the governor stops the compressor from pumping air.

A

False.

31
Q

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

A

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.

32
Q

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

A

True.

33
Q

What are spring brakes?

A

Spring brakes are powerful springs that are held back by air pressure. If the air pressure is removed, the springs apply the brakes.

34
Q

What is a slack adjuster?

A

A slack adjuster is a lever connecting the brake chamber push rod with the foundation brake camshaft.

CDL (6 decks)

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