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History > Air Breakes > Flashcards

Air Breakes Flashcards

1
Q

Emergency stop breaking is when you

A

Break as hard as you can release the brakes when the Wheels lock and put on the brakes again when the wheels start rolling

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2
Q

If air pressure does NOT build up to normal within the correct amount of time then:

A

Your air pressure may drop too low during driving requiring an emergency stop

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3
Q

Which of these is NOT a proper time to apply the parking brakes

A

If the brakes are very hot (e.g., after just coming down a steep grade)….

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4
Q

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

The proper method of breaking when going down long and/or steep grades after selecting the proper gear is to break until your speed is about _____miles per hour below your “safe” speed, then release your brakes

A

5

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6
Q

Under normal conditions in order to engage the parking brakes the driver must first

A

Let the air out of the air brake system

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7
Q

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

A

Brake leg

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8
Q

If you must make an emergency stop you should break so you

A

Can steer answer your vehicle stays in a straight line

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9
Q

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

The driver must be able to see a warning before air pressure in the service air tanks falls below___ PSI

A

60

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11
Q

You should know that your brakes are fading when

A

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

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12
Q

If the spring breaks are on when should you push the brake pedal

A

Never

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13
Q

The driver must be able to see a low air pressure warning which comes on before pressure in the service air tank falls below ___PSI

A

60

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14
Q

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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15
Q

The brake pedal in an air brake system

A

Controls the air pressure applied to put on the brakes

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16
Q

Parking or emergency brakes of trucks and buses can be legally held on by____ pressure.

A

Air

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17
Q

The most common type of foundation break found on heavy vehicles is the

A

S-cam drum

18
Q

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

A

Either the front or rear brakes will not be fully operational

19
Q

In air brake vehicles the parking brakes should be used

A

Anytime the vehicle is parked

20
Q

The air compressor Governor controls

A

When air is pumped into the air tanks

21
Q

The stop light switch

A

Turns on the brake lights to warn drivers behind you

22
Q

For air brake systems in good condition the compressor should start pumping at about____ PSIs

A

100

23
Q

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

A

Three PCI in 1 minute

24
Q

The breaking power of the spring brakes

A

Depends on the service brakes being in adjustment

25
Q

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

A

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

26
Q

If you are driving down a steep downgrade and you have reached your “safe” speed of 40 mph you should apply the service brakes until your speed drops to ____miles per hour

A

35

27
Q

The air brake lag distance at 55 mph on drive payment adds about____ feet to your stopping distance

A

32

28
Q

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

A

The loss of brake air pressure

29
Q

Emergency controlled braking is when you

A

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

30
Q

If your trucks air compressor has its own oil supply when should you first check the oil level

A

Before driving

31
Q

The air brake lag distance at 55 mph on dry payment adds about___feet to your stopping distance

A

32

32
Q

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

A

A loss of brake air pressure

33
Q

The air compressor should stop pumping at about____psi.

A

125

34
Q

All air brake equipped vehicles have

A

An Air supply pressure gauge

35
Q

Emergency controlled braking is when you

A

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

36
Q

The breaking power of the spring brakes

A

Depends on the service brakes being in adjustment

37
Q

During normal driving spring brakes are usually held back by

A

Air pressure

38
Q

The safety valve is usually set to automatically reduce pressure at___pci.

A

150

39
Q

If your truck’s air compressor has its own oil supply when should you first check the oil level

A

Before driving

40
Q

Emergency stab breaking is when you

A

Break as hard as you can release the brakes when the Wheels lock put on the brakes again when the wheels start rolling

History (7 decks)

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