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AIR BRAKES TEST > Air Brakes > Flashcards

Air Brakes Flashcards

1
Q

1) Which of the following about antilock braking systems is true?

A

ABS changes the way you brake in Emergencies.

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2
Q

2) In air brake vehicles, the parking brakes should be used:

A

Anytime the vehicle is parked.

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3
Q

3)If your antilock braking system is not working, you should:

A

Drive normally, but get the system serviced soon.

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4
Q

4)
Excessive use of the service brakes results in overheating, which can lead to:

A

Expansion of the brake drums.

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5
Q

5)
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system

A

Stop and safely park. Continue only after the system is fixed

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6
Q

6) The air compressor should stop pumping prior to reaching a — psi.

A

140

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7
Q

7)
The use of air brakes on a downgrade is only a supplement to the:

A

Braking effect of the engine

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8
Q

8)
Your truck has properly functioning dual air brake system and minimum size air tanks. The air pressure should build from 85-100 psi within
seconds.

A

45

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9
Q

9)
If your truck or bus 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.

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10
Q

10) The proper method of braking when going down long and/or steep grades after selecting the proper gear is to brake until your speed is about__ miles per hour below your “safe” speed, and then release your brakes.

A

5

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11
Q

It is not safe to drive a vehicle that has brake drums (or discs) with cracks or that are thinner than the manufacturer’s specifications, generally this will be __ inch.

A

1/4

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12
Q

12)
A supply pressure gauge tells you how much pressure is in the:

A

Air tanks

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13
Q

13)
Air braking takes more time than hydraulic braking because air:

A

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

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14
Q

14)
During normal driving, spring brakes are usually held back by:

A

Air pressure

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15
Q

15)
Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the unit filled with alcohol?

A

Ice may form in the air storage tanks and cause the brakes to fall

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16
Q

16)
The brake system that applies and releases the brakes when the driver uses the brake pedal is the__ system brake

A

Service

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17
Q

17)
In air brake vehicles, the parking brakes should be used:

A

Any tme the vehicle is parked

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18
Q

18)
Excessive heat in the brakes can cause the:

A

Brakes to fade or fall

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19
Q

19) To test air service brakes, you should:

A

Brake firmly when slowly moving forwards

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20
Q

20)
You should know your brakes are fading when:

A

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

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21
Q

21)
The air brake system for a straight truck or bus should not leak at a rate of more than __ psi per minute with the engine off and the brakes released.

A

2

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22
Q

22) - The braking power of the spring brakes:

A

Depends on the service brakes being in adjustment.

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23
Q

23)
If your truck has a dual air brake system and one of the systems is low on pressure:

A

Either the front or rear brakes will not be fully operational.

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24
Q

24)
The parking or emergency brakes of trucks and buses can be legally held on by ___ pressure

A

Spring pressure

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25
Q

25)
Modern air brake systems are three different systems combined together. They are the service, parking, and the ___ brakes.

A

Emergency

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26
Q

26)
The air supply pressure gauge shows how much pressure:

A

Is in the air tanks

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27
Q

27)
If you must make an emergency stop, brake so you:

A

Can steer and your vehicle stays in a straight line.

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28
Q

28)
If your vehicle has an alcohol evaporator, it is there to:

A

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

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29
Q

29)
The air brake lag distance at 55 mph on dry pavement adds about ___ feet to your stopping distance.

A

32

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30
Q

30)
The spring brakes used on tractors and straight trucks will bring your truck to a stop when the air pressure drops
Below ___ psi.

A

20

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31
Q

31)
When you apply the brakes, the brake shoes/linings are pressed against the:

A

Brake drum

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32
Q

32)
The use of air brakes on a downgrade is only a supplement to the:

A

Braking effect of the engine

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33
Q

33)
Why should you drain water from compressed air tanks?

A

Water can freeze in cold weather and cause brake failure

34
Q

34)
Repeatedly pressing and releasing (fanning) the brake pedal may result in:

A

The loss of brake air pressure.

35
Q

35)
The parking or emergency brakes of trucks and buses can be legally held on by
___ pressure.

A

Spring

36
Q

36)
The air compressor governor controls:

A

When air is pumped into the air storage tanks

37
Q

37)
The most common type of foundation brake found on heavy vehicies is the:

A

S-cam drum

38
Q

38)
You are on a steep downgrade and have reached your “safe” speed of 40 mph. You would apply the service brakes until your speed drops to___ mph

A

35

39
Q

39)
You should know brakes are fading when:

A

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

40
Q

40)
Under normal conditions, to engage the parking brake the driver must first:

A

Let the air out of the spring brakes.

41
Q

41) If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage air tanks?

A

At the end of each day for driving.

42
Q

42)
When is it OK to leave your truck unattended without applying the parking brake or chocking the wheels?

A

Never

43
Q

43)
What is the first thing you should do when a low air pressure warning comes on?

A

Stop and safely park as soon as possible.

44
Q

44)
The brake pedal in an air brake system:

A

Controls the air pressure applied to put on the brakes.

45
Q

45)
Before driving a truck or bus with a dual air brake system, the pressure in each system should be at least_____ psi

A

100

46
Q

46)
Moder air brake systems are three different systems combined together. They are the service, parking, and the
____brakes.

A

Emergency

47
Q

47) For air brake systems in good condition, the air compressor should start pumping at about ___ psi.

A

100

48
Q

48)
How should you check that the spring brakes come on when air pressure in the system drops below a certain
level?

A

Park on level ground, chock the wheels, release the parking brake when you have enough air pressure, shut the engine off, and repeatedly press and release the brake pedal.

49
Q

49)
The safety valve is set to automatically reduce pressure at __ psi.

A

150

50
Q

50)
Total stopping distance for vehicles with air brakes is longer than that for vehicles with hydraulic brakes due to ___
distance.

A

Brake lag

51
Q

51)
Air braking takes more time than hydraulic braking because air:

A

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

52
Q

52)
How should you check that your service brakes are working properly?

A

Wait for normal air pressure, release the parking brake, move the truck forward slowly, and apply the brake firmly using the brake pedal.

53
Q

53)
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:

A

3 psi in one minute

54
Q

54)
The proper method of braking when going down long and/or steep grades after selecting the proper gear is to brake until your speed is about ___
miles per hour below your “safe” speed, and then release your brakes.

A

5

55
Q

55)
All air brake equipped vehicles have:

A

An air supply pressure gauge.

56
Q

56)
The driver must be able to see a warning before air pressure in the service air tanks falls below ___psi.

A

55

57
Q

57)
If spring brakes are on, when should you push the brake pedal?

A

Never

58
Q

58)
Emergency controlled braking is when you:

A

Apply the brakes as hard as you can without locking the wheels.

59
Q

59)
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?

A

Stop and safely park. Continue only after the system is fixed

60
Q

60)
When you apply the brakes, the brake shoes/linings re pressed against the:

A

Brake drum

61
Q

61)
The most important thing to do when a low air pressure warning comes on is:

A

Stop and safely park as soon as possible.

62
Q

62)
If your vehicle has an alcohol evaporator, every day during cold weather you should:

A

Check and fill the alcohol level.

63
Q

63)
Total stopping distance for vehicles with air brakes is longer than that for vehicles with hydraulic brakes due to ____distance

A

Brake lag

64
Q

64)
When is it OK to leave your truck unattended without applying the parking brake or chocking the wheels?

A

Never

65
Q

65)
Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the unit filled with
alcohol?

A

Ice may form in the air storage tanks and cause the brakes to fail.

66
Q

66)
The modulating control valve allows you to control the:

A

Spring brakes

67
Q

67)
The S-cam:

A

Forces the brake shoes against the inside of the brake drum

68
Q

68)
What is emergency stab braking?

A

Brake hard, release the brakes when the wheels lock, and reapply the brakes when the wheels start rolling.

69
Q

69)
If your truck or bus 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.

70
Q

70)
Which of these is not a proper time to apply the parking breaks?

A

When your brakes are very hot.

71
Q

71)
The application pressure gauge shows how much air pressure you:

A

Are applying to the brakes.

72
Q

72)
The air brake lag distance at 55 mph on dry pavement adds about___
feet to your stopping distance.

A

32

73
Q

73)
If pressure does not build up fast enough within the correct amount of time:

A

Your air pressure may drop too low during driving.

74
Q

74)
The stop light switch:

A

Turns on the brake lights to warn drivers behind you.

75
Q

75)
Why should you drain water from compressed air tanks?

A

Water can freeze in cold weather and cause brake failure.

76
Q

76)
You are on a steep downgrade and have reached your “safe” speed of 40 mph. You would apply the service brakes until your speed drops to____
mph.

A

35

77
Q

77)
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:

A

Spring Pressure.

78
Q

78) Excessive heat in the brakes can cause the:

A

Brakes to fade or fail.

79
Q

79)
To check the brake slack on S-cam brakes, you should park on:

A

Level ground, chock the wheels, and release the parking brakes.

80
Q

80)
With air brake vehicles, the parking brakes should be used:

A

Whenever you leave the vehicle unattended.

81
Q

81)
A truck with air brakes going 55 mph would require a stopping distance of:

A

More than 300 feet.

AIR BRAKES TEST (1 decks)

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