AIR BRAKES TEST

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1) Why must air tanks be drained?
a) For pre trip inspection purposes
b) To check for leaks
c) To release oil and water buildup
d) To activate the low air pressure alarm
c) To release oil and water buildup

2) What is a supply pressure gauge used for?
a) To check tire pressure
b) To check tank pressure
c) To activate the low pressure alarm
d) To check for leaks
b) To check tank pressure

4) What are spring brakes?
a) Hydraulic brakes
b) Air brakes
c) Emergency/parking brake
d) Trailer brakes
c) Emergency/parking brake

5) Front wheel brakes are good under all conditions. True or False?
a) True
b) False
a) True

You should know that your brakes are fading when?
a. You have to push harder on the brake pedal to control your down hill speed
b. The brake pedal feels spongy when you apply pressure
c. Pressure on the brake pedal is released and speed increases
You have to push harder on the brake pedal to control your down hill speed

2. If the spring brakes are on when should you push the brake pedal?
a. Only when driving down hill
b. Only on a slippery road
c. Never
c. Never

Repeatedly pressing and releasing (fanning) the brake pedal may result in?
a. A loss of air pressure
b. A build up of air pressure
c. No change in brake air pressure
a. A loss of air pressure

4. 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. 40
b. 60
c. 80
b. 60

5. If your truck or bus has dual parking control valves you can use pressure from a separate tank
a. To balance the service brake system when you are parked
b. To stay parked twice as long without using up service air pressure
c. To release the emergency/spring/parking brakes to move a short distance
c. To release the emergency/spring/parking brakes to move a short distance

6. The brake pedal in a air brake system
a. Controls the speed of the air compressor
b. Controls the air pressure applied to put on the brakes
c. Is connected to slack adjusters by a series of rods and linkages
b. Controls the air pressure applied to put on the brakes

7. To check the free play of manual slack adjusters of S-Cam brakes, you should
a. Park on level ground and apply the parking brakes
b. Park on a slight grade, release the parking brakes
c. Park on level ground, chock the wheels, release the parking brakes and pull on the slack adjusters
c. Park on level ground, chock the wheels, release the parking brakes and pull on the slack adjusters

8. Parking or emergency brakes on trucks or buses can be legally held on by ______ Pressure.
a. Spring
b. Fluid
a. Spring

9. Emergency stab braking is when you
a. Press hard on the brake pedal and apply full pressure on the hand valve until you stop
b. Use light steady pressure on the brake pedal
c. Brake as hard as you can, then release the brakes when the wheels lock up and put on the brakes again when the wheels start rolling
c. Brake as hard as you can, then release the brakes when the wheels lock up and put on the brakes again when the wheels start rolling

10. The most common type of foundation brake found on heavy vehicles is the
a. Wedge drum
b. Disc Brake
c. S-Cam
c. S-Cam

11. If your truck has dual air brake system and one of the systems is low on pressure.
a. The manual slack adjusters on S-Cam brakes are not set properly
b. The brake drums will not be fully operational
c. Either the front or rear brakes will not be fully functional
c. Either the front or rear brakes will not be fully functional

12. The most important thing to do when a low-pressure warning light comes on is to.
a. Up shift
b. Down shift
c. Stop and safely park as soon as possible
c. Stop and safely park as soon as possible

13.With air brake equipped vehicles, the parking brakes should be used
a. As little as possible
b. Any time the vehicle is parked
c. To hold your speed when going down hill
b. Any time the vehicle is parked

14. The air compressor governor controls
a. When air is pumped into the tanks
b. The speed of the air compressor
c. Air pressure applied to the brakes
a. When air is pumped into the tanks

15. The stop light switch
a. Turns on the brake light to warn other drivers behind you
b. Tells you when you need to use your emergency brakes
c. Tells you when the air brake system is low on air pressure
a. Turns on the brake light to warn other drivers behind you

16. For air brake systems in good condition the air compressor should start pumping at about _____ PSI
a. 100
b. 125
c. 150
a. 100

17. The air loss rate for a straight truck or bus with the engine off and the parking brakes off and the service brakes on should not be more than
a. 1 PSI in one minute
b. 2 PSI in 45 seconds
c. 3 PSI in one minute
c. 3 PSI in one minute

18. The braking power of the spring brakes
a. Depends on the service brakes being in adjustment
b. Is not affected by the condition of the service brakes
c. Can only be tested by highly trained brake service personnel
a. Depends on the service brakes being in adjustment

19. How should you check spring brakes application when air pressure drops below a certain level
a. Park on a slight incline drain off air pressure, set parking brakes and check for movement
b. Park on level ground, chock wheels, release parking brake when you have enough pressure shut the engine off and repeatedly press and release the pedal
c. Park on level ground wait for normal air pressure, release the parking brake, move the truck forward slowly and apply the brakes firmly using the brake pedal
b. Park on level ground, chock wheels, release parking brake when you have enough pressure shut the engine off and repeatedly press and release the pedal

20. If you are driving down a steep grade and have reached a safe speed of 40 MPH you would apply the services brakes until your speed drops to ______MPH
a. 25
b. 30
c. 35
c. 35

21. Air brake lag distance at 55 MPH adds about ________feet to your stopping distance
a. 12
b. 32
c. 52
b. 32

**22. How should you check that your service brakes are working properly?
a. Park on a slight grade, drain off air pressure set parking brake, check movement
b. Park on level ground, chock wheels, engage parking brake when you have the correct amount of air pressure shut off the engine
c. 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
c. 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. Emergency controlled braking is when you?
a. Applying the brakes as hard as you can without locking up the brakes
b. Brake as hard as you can release the brakes when the wheels lock up and put the brakes back on again when the wheels start rolling
c. Apply the hand valve for one second then push hard on the brake pedal
a. Applying the brakes as hard as you can without locking up the brakes

24.Which of these is not a proper time to apply the parking brake?
a. If the brakes are very hot (eg. Just after coming down a steep grade)
b. If you will be stopping for only one hour
c. If your going to test the parking brake to make sure that it holds the vehicle
a. If the brakes are very hot (eg. Just after coming down a steep grade)

25. All air brake equipped vehicles have
a. A supply air pressure gauge
b. A air use gauge
c. A backup hydraulic system
a. A supply air pressure gauge

26. If air pressure does not build up to normal within the correct amount of time then
a. You should be ready to use your parking brake to help stop
b. The alcohol evaporator container may be low
c. Your air pressure may drop too low during driving requiring an emergency stop
c. Your air pressure may drop too low during driving requiring an emergency stop

27. Excessive use of the service brakes results in over heating which can lead to
a. Improper adjustment of the S-Cam
b. Increased contact between brake drums and brake linings
c. Expansion of the brake drums
c. Expansion of the brake drums

28. 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 _____MPH below your “safe” speed then release your brakes
a. 5
b. 10
c. 15
a. 5

29. Under normal conditions in order to engage the parking brakes the driver must first
a. Turn off the engine
b. Let the air out of the air brake system
c. Be sure that the air brake system is fully pressurized
b. Let the air out of the air brake system

30. Total stopping distance for air brakes is longer than for hydraulic brakes due to
a. Brake lag
b. Reaction
c. Effective braking
a. Brake lag

31. If you must make an emergency stop you should brake so you
a. Can use the hand brake before the brake pedal
b. Can steer and your vehicle stays in a straight line
c. Can use the full power of the brakes to lock them up
b. Can steer and your vehicle stays in a straight line

32. The parking or emergency brakes on a heavy vehicle can only be held in position by some thing that cannot leak away like
a. Spring pressure
b. Air pressure
c. Hydraulic pressure
a. Spring pressure

33. Some air brake systems have an alcohol evaporator what may happen if you don’t keep the unit filled?
a. The S-Cam may not rotate back when you release the brake pedal
b. Ice may form in the air storage tanks or air lines and cause brakes to fail
c. Ice may form on the brake drums and warp them
b. Ice may form in the air storage tanks or air lines and cause brakes to fail

34. 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
b. Service

35. Before driving a truck or bus with dual air brake system the pressure in each system should be at least _____PSI
a. 80
b. 100
c. 120
b. 100

36. Your truck or bus has a dual air brake system if a low air pressure warning comes on for only one system what should do
a. Reduce your speed and drive to the nearest dot certified garage for repairs
b. Reduce your speed and test the remaining system while under way
c. Stop right away and safely park the truck, continue only after the system is fixed
c. Stop right away and safely park the truck, continue only after the system is fixed

37.What happens when your brake drums get very hot
a. They contract
b. They start to smoke
c. They expand
c. They expand

38. How often should the air tanks be drained
a. When ever the brakes feel spongy
b. Once a week
c. Daily
c. Daily

39. An air application gauge shows you
a. How much air pressure is in your tanks
b. How much air pressure you are applying to the brakes
c. How much air pressure is escaping through your brake chamber
b. How much air pressure you are applying to the brakes

40. The difference between controlled braking and stab braking is ___
a. Controlled braking is only used on wet roads
b. Controlled braking is for combination vehicles stab braking is for single vehicles
c. Controlled braking does not lock the wheels stab braking involves locking the wheels
c. Controlled braking does not lock the wheels stab braking involves locking the wheels

41. Front brake limiting valves reduce the air pressure applied to the front brakes by
a. ¼
b. 1/3
c. ½
c. ½

42. To charge/release the brakes with air you
a. Pull the valves out
b. Push the valves in
c. Leave the valves in the normal position
b. Push the valves in

43. The tractor air supply valve is what color
a. Red
b. Yellow
c. Blue
b. Yellow

44.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
b. 1 minute
c. 2 minutes
a. 45 seconds

45. Brake drums must not have cracks longer than _____the width of the friction area
a. ¼
b. ½
c. 1/3
b. ½

46. In single air systems (pre 1975) air pressure should build from 50-90 PSI within ____ Minutes
a. 2
b. 3
c. 4
b. 3

47. In air operated disc brakes air pressure acts on a brake chamber and slack adjuster like S-Cam brakes but instead of the S-Cam a ____ is used
a. Brake screw
b. Power screw
c. Air pressure Screw
b. Power screw

48. A safety relief valve is used to protect the air system from too much air pressure this valve is usually set to open at ____PSI
a. 130 PSI
b. 150 PSI
c. 160 PSI
b. 150 PSI

49. Tractor and straight truck spring brakes will apply fully when air pressure drops to a range of ____PSI
a. 20-50
b. 30-45
c. 20-45
c. 20-45

50. On large buses it is common for the low pressure warning devices to signal at ____PSI
a. 60-65
b. 70-75
c. 80-85
c. 80-85

6) What is a dual air brake system?
a) 2 systems which use a single set of brake controls
b) 2 brake controls that operate from a single system
c) A system that uses 2 brake controls
d) A single brake that operates 2 systems
a) 2 systems which use a single set of brake controls

7) What are the slack adjusters?
a) Adjusts the pressure in the tank
b) Adjusts the spring brakes
c) Adjusts the slack in the brake pedal
d) Adjusts the slack in the brakes
d) Adjusts the slack in the brakes

8) How can you test the low pressure warning signal?
a) Apply parking brake and pump the brake pedal again and again
b) Push in on the adjuster
c) Release the parking brake, pull hard on the adjuster
d) Slam on the brakes traveling 20 mph or over
a) Apply parking brake and pump the brake pedal again and again

9) How can you check that the spring brakes come on automatically?
a) Release parking brake and press the brake pedal again and again
b) Apply parking brake and press brake pedal again and again
c) Slam on the brakes while traveling 20 mph or more
d) Apply and release parking brake again and again
a) Release parking brake and press the brake pedal again and again

10) What are the maximum leakage rates?
a) More than 2 psi in one minute
b) More than 2 psi in two minutes
c) More than 3 psi in one minute
d) More than 3psi in two minutes
c) More than 3 psi in one minute

11) Why should you be in the proper gear before starting down a cliff?
a) The use of brakes is only a supplement to the braking effect of the engine
b) So the brakes will not get too hot and start to catch fire
c) To save wear and tear on the transmission
d) So you will not pick up too much speed
a) The use of brakes is only a supplement to the braking effect of the engine

12) What factor can cause brakes to fade or fail?
a) Driving in a heavy rain
b) Excessive use of service brakes
c) Driving in heavy traffic
d) Excessive use of emergency brake
b) Excessive use of service brakes

13) The use of brakes on a long steep downgrade is only a supplement to the braking effect
~of the engine. True or False?
a) True
b) False
a) True

18) Why should you NOT fan the brakes on and off during long downgrades?
a) Does not allow brakes to cool
b) The brake linings do not get hot when fanning
c) There is less air usage when fanning
d) None of these
a) Does not allow brakes to cool

20) A straight truck or bus air brake system cannot leak more than——-psi per minute
with engine off and brakes “released”.
a) I
b) 2
c) 3
d) 4
b) 2

21) A combination vehicle air brake system cannot leak more than— psi per minute
with engine off and brakes “released”.
a) 4
b) 3
c) 2
d) 1
b) 3

22) During normal operations, what are the parking and emergency brakes usually held
back by?
a) Bolts/clamps
b) Centrifugal force
c) Spring pressure
d) Air pressure
d) Air pressure

23) When do you use the parking brake in air brake equipped vehicles?
a) Only during pre-trip and post-trip inspections
b) Every time you park the vehicle
c) As little as possible
d) When slowing down
b) Every time you park the vehicle

25) If the air system develops a leak, what will keep the air in the tanks?
a) The one’-way check valve
b) The emergency relay valve
c) The tractor protection valve
d) The governor
a) The one’-way check valve

26) Which of these is normal to find in the air brake system?
a) Water
b) Air
c) Oil
d) All of these
b) Air

• 27) What turns on the electrical stop light switch in an air brake system?
a) The driver (by hand)
b) Air pressure
c) Hydraulic pressure
d) Spring pressure
b) Air pressure

28) If the vehicle is equipped with an alcohol evaporator, what should you
do everyday during winter weather?
a) Drain the accumulated alcohol
b) Use 5 weight oil to oil the system
c) Change the alcohol from a new bottle
d) Check and fill the alcohol level
d) Check and fill the alcohol level

29) If a failure occurs in the service brake system, what system do you need to stop the
vehicle?
a) Hand brake system
b) Drum brake system
c) Emergency brake system
d) Parking brake system
c) Emergency brake system

31) What does the brake pedal do?
a) Exerts force on the slack adjusters by rods and connectors
b) Controls the air pressure to operate the brakes
c) Can be used as a foot rest
d) Is the systems main lever
b) Controls the air pressure to operate the brakes

37) Air loss in a single vehicle (not comb. vehicle) should not be more than _________with engine off and ‘brakes on’.
a) 3 psi in one minute
b) 2 psi in 45 seconds
c) I psi in one minute
d) I psi in 30 seconds
a) 3 psi in one minute

38) Three systems are found in modern air brake systems, Service brakes,
Parking brakes and:
a) Drum brakes
b) S-cam brakes
c) Foot brakes
d) Emergency brakes
d) Emergency brakes

43) What is the purpose of the engine retarders?
a) To prevent skids and slides
b) `Applies extra braking power to non-drive aXles
c) Helps slow the vehicle and reduce brake wear
d) Provides emergency brakes
c) Helps slow the vehicle and reduce brake wear

51) Slack adjusters on s-earn brakes need adjustment if they move more than two inches
when the push rod attaches.
a) True
b) False
a) True

52) With the engine at operating rpm, the air pressure should build from 85 to 100 psi in 45
seconds in a dual air system.
a) True
b) False
a) True

75) You should maintain steady pressure on the brakes and bold the steering wheel firmly
when the wheels lock up.
a) True
b) False
b) False

73) While testing the service brakes, if your vehicle pulls to one side, there may be a
problem with the service brakes.
a) True
b) False
a) True

84) Which of the following makes total stopping distance longer for air brakes than
hydraulic?
a. perception distance.
b. reaction distance.
c. brake lag.
c. brake lag.

90) An air brake system safety relief valve opens at about:
a. 20 to 45 psi.
b. 120 psi.
c. 150 psi.
c. 150 psi.

91) When some air brakes in the system are doing more work than others:
a. those brakes will develop more heat.
b. vehicle handling will be effected.
c. all the above.
c. all the above.

92) Your safety relief valve has opened several times. This means _.
a. the system is working properly.
b. your pressure is probably low.
c. the system needs immediate attenb~on.
c. the system needs immediate attenb~on.

95) To test the air compressor on a dual air brake vehicle, run the engine at a fast idle to
charge the air the system. Your gauges should show your_ .
a. pressure builds from 85 to 100 psi with-in three minutes.
b. your pressure builds from 85 to 100 psi with-in 45 seconds.
c. the compressor cuts out by 75 psi.
b. your pressure builds from 85 to 100 psi with-in 45 seconds.

96) Spring brakes are applied by ~?
a. air pressure.
b. electrical current.
c. a means other than air, electrical or hydraulic.
c. a means other than air, electrical or hydraulic.

97) Most large vehicles with air brakes have spring brakes which .
a. are part of the parking brake systems operation only.
b. are part of the service brake system only.
c. are part of both the parking and emergency brakes.
c. are part of both the parking and emergency brakes.

98) What color is the parking control knob on the dash of the vehicle?
a. red.
b. green.
c. yellow.
c. yellow.

99) What would cause all of the air brake systems on a vehicle to have poor braking power.
a. low hydraulic fluid.
b. brakes being out of adjustment.
c. a broken air line.
b. brakes being out of adjustment.

101) “Cut – in” pressure is normally set to psi.
a. 100.
b. 125.
c. 150.
a. 100.

103) Which of the following is not an air brake subsystem?
a. Spring brake system.
b. Service brake system.
c. Parg brake system.
a. Spring brake system.

104) What is a “Wig Wag”?
a. A mechanical arm that signals low air pressure.
b. A spring mount for hair pieces.
c. Part of the stop light system.
a. A mechanical arm that signals low air pressure.

105) “Cut – out” pressure is normally set to psi.
a. 10O~
b. 125.
c. 150.
b. 125.

106) Front brake limiting valves are found on:
a. Older vehicles made before 1975.
b. New ‘Import vehicles only.
c. School buses.
a. Older vehicles made before 1975.

You should not back a tractor under a trailer until the whole air system is:
A. At normal pressure
B. Bled down to half the maximum pressure
C. Between 60-80 psi
D. Empty
A. At normal pressure

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