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Class A Drivers License, CA > Air Brakes > Flashcards

Air Brakes Flashcards

0
Q 
The air compressor governor controls? 
A The RPMs of the air compressor
B whether the compressor is on or off
C Air pressure applied to the brakes
D when the compressor well pump air into the storage tanks
A

D when the compressor will pump air into the storage tanks

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1
Q 
Which brake system applies and releases the break when the driver uses the brake pedal?
A The emergency brake system
B The service break system
C The parking brake system
D none of the above
A

B The service break system

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2
Q 
When a failure occurs in the service break system the system you need to stop the vehicle is the?
A parking brake system
B The emergency brake system
C drum brake system
D The handbrake system
A

B The emergency brake system

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3
Q 
Three different systems are found on a modern air brake system service breaks the parking brake and the?
A emergency brakes
B foot brakes
C S – Cam brakes
D drum brakes
A

A emergency brakes

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4
Q

If your vehicle has an alcohol evaporator it is there too?
A get rid of alcohol that condenses in the air tanks
B let the driver skip daily tank drainIng
C increase tank pressure the way superchargers boost engines
D reduces the risk of ice in the air brake valves in cold weather

A

D reduces the risk of ice in the airbrake valves in cold weather

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5
Q 
Oil and water usually collect in compress it air tanks if you do not have automatic tank and drains when should you drain the air tanks?
A after four hours of service
B after every working day
C once a week
D every other week
A

B after every working day

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6
Q

The brake pedal:
A is the main lever in the system?
B can be a foot rest during normal driving
C Controls the air pressure applied to operate the service brakes
D excerpts force on the slack adjusters by rods and connectors

A

C Controls the air pressure applied to operate the service brakes

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7
Q

If your vehicle is equipped with an alcohol evaporator every day during cold weather you should?
A check infield the alcohol level
B change the alcohol from a new bottle
C Oil the system with 5 weight oil
D drain out the op alcohol which has accumulated

A

A check infield the alcohol level

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8
Q 
Which of the following is okay defined in the air brake system?
A oil
B air
C water
D all of the above
A

B air

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9
Q

Why drain water from compressed air tanks?
A The low boiling point of water reduce braking power
B water can freezing cold weather and cause brake failure
C water over cools the compressor
D to keep from fouling up the air compressor

A

B water can freezing cold weather and cause brake failure

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10
Q 
The most common type of foundation break found on have a commercial vehicles is:
A disc
B wedge and drum
C s-cam drum 
D none of the above
A

C s-cam drum

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11
Q 
The air supply pressure gauge shows the driver how much pressure:
A has been used on this trip
B is available in the air tanks
C is being sent to the brake chambers
D none of above
A

B is available in the air tanks

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12
Q

When using the parking brake or emergency brake what type of pressure is being used

A fluid pressure
B Spring pressure
C Air pressure
D any of the above

A

B Spring pressure

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13
Q

Airbrake equipment vehicles must have?

A at least three air tanks
B he hydraulic braking system in case the air system fails
C and air pressure gauge to show the pressure available for braking
D and air application gauge to show the pressure available for braking

A

C and air pressure gauge to show the pressure available for braking

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14
Q 
You can tell if your vehicle is equipped with antilock braking system if there is a\_\_\_\_\_\_\_ malfunction lamp on the dashboard
A red
B blue
C yellow
D green
A

C yellow

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15
Q 
The application pressure gauge shows the driver how much pressure
A has been used on this trip
B is in the air tanks
C is being applied to the brakes
D none of the above
A

C is being applied to the brakes

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16
Q

The vehicle must have a warning device which comes on when air pressure in the service air tanks falls below?

A 40 psi
B 55 psi
C 60 psi
D 80 psi

A

C 60 psi

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17
Q 
During normal operations the parking an emergency brake are usually held back by?
A Air pressure
B Spring pressure
C centrifugal force
D bolts or clamps
A

A air pressure

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18
Q 
What turns on the electrical stoplight switch in airbrake system?
A Spring pressure
B hydraulic pressure
C Air pressure
D The driver by hand
A

C Air pressure

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19
Q

In in airbrake equipped vehicle when do you use the parking brakes?
A when slowing down
B as little as possible
C whenever you park the vehicle
D only during pre-and post trip inspections

A

C whenever you park the vehicle

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20
Q

What will determine how effective the spring emergency brakes or the parking break or working?
A has nothing to do with the condition of the service breaks
B can only be tested by highly trained brake service people
C depends on the adjustment of the service brakes
D it increases when the service brakes are hot

A

C depends on the adjustment of the service brakes

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21
Q

If your truck or bus has dual parking control valve you can use pressure from a separate tank to?
A release the emergency brakes to move a short distance
B apply more brake pressure for stopping if the main tank is getting low
C stay parked without using up service air pressure
D balance the service break system while you drive

A

A release the emergency brakes to move a short distance

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22
Q

Your vehicle has dual air brake system if a little warning pressure comes on for the secondary system you should?

A stop safely park and continue only when the system is repaired
B reduce your speed and test the remaining system well underway
C reduce your speed and drive to the nearest garage for service
D continue at normal speed no action is needed when the secondary system fails

A

A stop safely parking continue only when the system is repaired

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23
Q 
Of the choices below the first thing to do when a low pressure warning comes on is:
A stop in safely park as soon as you can
B upshift
C adjust the brake pedal for more travel
D Open the air supply control valve
A

A stop in safely park as soon as you can

24
Q 
When does the drivers manual advise disconnecting the steering axle brakes to help keep the unit straight?
A never
B when the road is slippery
C when driving in very hilly areas
D when towing a trailer that has brakes
A

A never

25
Q

How would you use the stab breaking technique during an emergency braking?

A brake hard with the brake pedal and hand valve until stopped
B Brake hard with the pedal until the wheels lock then let off the brakes for a long as the wheels were locked
C Break hard with the pedal until the wheels lock then let off until the wheels are rolling again
D pump the brake pedal rapidly and lightly

A

C Break hard with the paddle until the wheels locked then let off until the wheels are rolling again

26
Q

On a heavy vehicle the emergency brake is usually held in place by spring pressure because air pressure can leak away

A true
B false

A

A true

27
Q 
The color of the parking control knob on the dash of the vehicle is?
A yellow 
B red
C blue
D green
A

A yellow

28
Q 
A tractor truck or bus equipped with antilock braking system\_\_\_\_\_\_\_\_
A decreases braking distance
B increased braking distance
C avoids wheel lock up
D is used on wet pavement
A

C avoids wheel lock up

29
Q

During normal driving parking & emergency brakes are usually held back by

A Spring pressure
B Air pressure
C centrifugal force
D hand valve

A

B Air pressure

30
Q

How do you check at the free play on manual slack adjusters?
A stop on level ground and apply the emergency brakes
BPark on level ground Chuck the wheels release the parking brakes and pulled the slack adjuster
C Park on level ground and drain off air pressure before making adjustments
D apply the service breaks by hand at the brake chambers and watch the slack adjusters move

A

B Park on level ground chalk the wheels release the parking brakes and pulled the slack adjuster

31
Q

The air leakage rate for a combination vehicle engine off brakes on should be less then_____PSI per minute?

A 1psi
B 2 psi
C 3 psi
D 4 psi

A

D 4 psi

32
Q

With the engine off in the brakes released a combination vehicle airbrake systems should not leak more then how many PSI per minute?

A 1 psi
B 2 psi
C 3 psi
D 4 psi

A

C 3 psi

33
Q

A straight truck or bus airbrake system cannot leak more then_____PSI per minute with the engine off and the brakes released?

A 1 psi
B 2 psi
C 3 psi
D 4 psi

A

B 2 psi

34
Q 
Air loss in a straight vehicle (not in a combination unit) should not be more than\_\_\_\_\_\_psi with the engine off in the brakes on?
A 1 psi in 30 sec
B 1 psi in 60 sec
C 2 psi in 45 sec
D 3 psi in 60 sec
A

D 3 psi in 60 sec

35
Q

When should you test the parking brake? When the vehicle is:

A parked
B moving slowly
C going down hill
D moving at highway speed

A

A parked

36
Q

You must make a quick emergency stop you should break it as you

A steer hard as you break hard
B use the full power of the brakes and lock them
C stay in a straight line and maintain steering control
D burn up in the handbrake first

A

C Stay in a straight line and maintain the steering control

37
Q

To use the stab breaking technique during emergency braking you:
A pump the brake pedal rapidly and lightly
B Break hard with the pedal until the wheels lock and get off the break until the wheels begin rolling again
C Break hard with the pet on till the wheels lock up and get off the brakes for as long as the wheels are locked
D Break hard with the paddle and hand valve until you stop

A

B Break hard with the paddle until the wheels locked think it off the break until the wheels begin rolling again

38
Q

You know when your brakes are feeding when

A you need more brake pressure to keep the same speed on a downgrade
B The brake pedal fades away when you press on it
C you get off the brake pedal and speed increases
D you need less pressure on the brake pedal for each stop

A

A you need more brake pressure to keep the same speed on a downgrade

39
Q

Why should you not fan your brakes on and off during long downgrades

A Air usage is less when you fan
B brake linings do not get hot when fanning
C The short time off brakes it does not allow break cooling
D none of the above

A

C The short time off the brakes does not allow brake cooling

40
Q

Air breaking takes more time than hydraulic breaking because air

A brakes use different brake drums
B takes more time to flow through the lines then hydraulic
C brakes require heavy year return springs
D is always leaking through airline fittings

A

B takes more time to flow through the lines then hydraulic

41
Q 
Which of the following makes the total stopping distance for airbrakes longer than that for hydraulic brakes
A perception distance
B reaction distance
C Brake lag distance
D effective braking distance
A

C Brake a lag distance

42
Q

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

A emergency
B Service
C parking
D none of the above

A

B Service

43
Q

The driver must be able to see a warning that is given when air pressure in the service air tanks falls below?

a 40 psi
B 50 psi
C 60 PSI
D 75 PSI

A

C 60 PSI

44
Q

An airbrake systems safely relief valve opens at about?

A 40 psi
B 120 psi
C 150 psi
D 200 psi

A

C 150 psi

45
Q 
When some airbrakes in the system are doing more work and then others
A those brakes will develop more heat
B you may experience brake fade
C vehicle handling will be affected
D all of the above
A

D all the above

46
Q

Your safety relief valve has opened several times this means_______

A The system is working properly
B Air pressure is probably low
C The system needs immediate attention
D The system needs flushed

A

C The system needs immediate attention

47
Q

At what air pressure should the low air warning alarm come on

A 45 psi
B 25 psi
C must come on by 60 PSI
D 150 psi

A

C must come on by 60 PSI

48
Q

With the brakes released on the single vehicle what is the allowable air loss

A four psi
B three PSI
C two psi
D One psi

A

C to psi

49
Q

To test the compressor on a dual airbrake vehicle run the engine at a fast idle to charge the air system your gauge should be showed you

A pressure builds from 85 to 100 psi within three minutes
B your pressure builds from 85 to 100 psi within 45 seconds
C The compressor cuts out by 75 PSI
D none of the above applies

A

B your pressure builds up from 85 to 100 psi within 45 seconds

50
Q

Spring breaks are held on by_________

A Air pressure
B electrical current
C forces other than air electrical or hydraulic
D The drivers hand valve

A

A air pressure

51
Q

Most large vehicles with airbrakes have spring break which?

A are part of the parking brake systems operation only
B is part of the service break system only
C are part of both the parking in emergency brakes
D is part of the front suspensions only

A

C are part of both the parking emergency brakes

52
Q

What color is the parking control knob on the dash of the vehicle

A red
B green
C yellow
D black

A

C yellow

53
Q

What would cause all of the airbrake systems on the vehicle to have poor breaking power

A Low hydraulic fluid
B brakes being out of adjustment
C A broken air line
D Low too heavy

A

B breaks been out of adjustment

54
Q

If a low air pressure warning comes on what should you do
A stop in safely park your vehicle soon as possible
B you can safely continue until you get to the next service center
C turn it off so that it will not distract you
D steer onto the left shoulder

A

A Stop at and safely park your vehicle as soon as possible

55
Q

Operating a vehicle equipped with antilock brakes and helps you avoid wheel lock up
A true
B balls

A

A true

56
Q

When only the tractor is equipped with ABS you should
A always pull a trailer equipped with ABS
B be able to maintain control in a skid
C be prepared to lose control
D disconnect the ABS on the tractor

A

B be able to maintain control in a skid

57
Q

You still have a normal break functions if your ABS is not working

A true
B false

A

A true

Class A Drivers License, CA (2 decks)

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