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General Knowledge > Air Brakes > Flashcards

Air Brakes Flashcards

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1
Q

You should know your brakes are fading when?

A

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

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2
Q

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

A

Never

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3
Q

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

A

A loss of air pressure

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4
Q

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

A

60

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5
Q

If your truck or bus has dual parking control valves you can use the pressure from a separate tank

A

To release the emergency/spring/parking brakes to move the vehicle a short distance

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6
Q

The brake pedal in the air brake system

A

Controls the air pressure applied to put on the brakes

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7
Q

To check the free play of manual slack adjusters of S-Cam brakes, you should

A

Park on level ground, chock the wheels, release the parking brakes and pull on the slack adjusters

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8
Q

Parking or emergency brakes on trucks/buses can be legally held on by_____pressure?

A

Spring

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9
Q

Emergency or stab braking is when you

A

Brake as hard as you can, release the brakes when the wheels lock up and put on the brakes again when the wheels start rolling

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10
Q

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

A

Disc brake

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11
Q

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

A

Either the front or rear brakes will not be fully functional

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12
Q

The most important thing to do when low-pressure warning light comes on is to

A

Stop and safely park as soon as possible

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13
Q

With air brake equipped vehicles, the parking brake should be used

A

Anytime the vehicle is parked

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14
Q

The air compressor governor controls

A

When air is pumped into the tank

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15
Q

The stop light switch

A

Turns on the brake light to warn other drivers behind you

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16
Q

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

A

100

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17
Q

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

A

3 psi in one minute

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18
Q

The braking power of spring brakes

A

Depends on the service brakes being in adjustment

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19
Q

How should you check spring brakes application when air pressure drops below a certain level

A

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

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20
Q

If you are driving down a steep grade and have reached a safe speed of 40 MPH you would apply the service brakes until your speed drops to _______ MPH

A

35

21
Q

Air braking lag distance at 55 MPH adds about _______ feet to your stopping distance

A

32

22
Q

How should you check that your service brakes are working properly

A

Park on level ground wait for normal air pressure, release the parking brake, move forward slowly and apply the brakes firmly using the brake pedal

23
Q

Emergency controlled braking is

A

Applying the brakes as hard as you can without locking up the brakes

24
Q

Which of these is not a proper time to apply the parking brake

A

If the brakes are very hot ( ex. Just after coming down a steep grade)

25
Q

All air brake equipped vehicles have

A

A supply air pressure gauge

26
Q

If the 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

27
Q

Excessive use of service brake results in overheating which can lead to

A

Expansion of the brake drum

28
Q

The proper method of braking when going down long or steep grades, after selecting the proper gear is the brake until your speed is about ______ MPH below your “safe” speed then release your brakes

A

5

29
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

30
Q

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

A

Brake lag

31
Q

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

A

Can steer and your vehicle stays in a straight line

32
Q

The parking of emergency brakes on a heavy vehicle can only be held in place by something that cannot leak away

A

Spring pressure

33
Q

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

A

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

34
Q

The brake system that applies and released the brakes when the driver uses the brake pedal is the ______ brake system

A

Service

35
Q

Before driving a truck or bus with a dual air brake system the pressure in each system should be at least ________ PSI

A

100

36
Q

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

A

Stop right away and safely park the truck, continue only after the system is fixed

37
Q

What happens when your brake drums get very hot

A

They expand

38
Q

How often should the air tanks be drained

A

Daily

39
Q

An air application gauge shows you

A

How much air pressure you are applying to the brakes

40
Q

The difference between controlled braking and stab braking is

A

Controlled braking does not lock the wheels, stab braking involves locking the wheels

41
Q

Front brake limiting valves reduce the air pressure applied to the front brakes by

A

1/2

42
Q

To charge/release the brakes with air you

A

Push the valves in

43
Q

The tractor air supply valve is what color

A

Red

44
Q

When the engine is at operating RPM the pressure should build up to 85 to 100 PSI within ________ in dual air systems

A

45 seconds

45
Q

Brake drums must not have cracks longer than _______ the width of the friction area

A

1/2

46
Q

In single air systems (pre 1975) air pressure should build up from 50-90 PSI within _______ minutes

A

3

47
Q

In air operated discs brakes air pressure acts on the brake chamber and slack adjuster like S-Cam brakes but instead of the S-Cam a ________ is used

A

Power screw

48
Q

A safety relief valve is used to protect the air system from too much air pressure this is usually set to open at ________PSI

A

150 PSI

49
Q

Tractor straight truck spring brakes will apply fully when air pressure drops to a range of _______ PSI

A

20-45 PSI

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