Air Brake Review Test

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This practice test is designed to help you prepare for the Air Brake written test. Once you have completed the test, you may view your test results to see which questions were answered incorrectly.

A score of 80% is required to pass the test.

In other words: You must get at least 72 correct answers, or no more than 18 incorrect answers on this test to pass.

You may retake the test as often as you like. GOOD LUCK!!!

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Your Name

1 point

1. When a trailer's service brakes fail to apply, the trailer spring brakes can be applied using the: *

1 point

Tractor protection valve.

Trailer hand valve.

Trailer supply valve.

Brake pedal.

2. "S" cam brake components include: *

1 point

Rotors and brake drums.

Camshafts and brake calipers.

Camshafts and brake shoes.

Calipers and rotors

3. Disc brake components include: *

1 point

Rotors and brake drums.

Camshafts and brake calipers.

Camshafts and brake shoes.

Calipers and rotors.

4. Wedge brake components include: *

1 point

brake drums and brake shoes.

Camshafts and brake calipers.

Rotors and brake drums.

Calipers and rotors.

5. Brakes convert the energy of a moving vehicle into: *

1 point

Water

Compressed air

Heat

Noise

6. Hydraulic brake systems use: *

1 point

Steam

Compressed air

Water

Brake fluid

7. The brake system on most large commercial vehicles use: *

1 point

Compressed air to apply the brakes.

Steam to apply the brakes.

Water to apply the brakes.

Brake fluid to apply the brakes.

8. When air brakes are applied or released, the brakes will respond: *

1 point

After a split-second delay.

Directly and immediately.

Slower at slower speeds.

Faster at higher speeds.

9. A vehicle's brakes must do more work when: *

1 point

The vehicle goes slower.

The vehicle goes faster.

The vehicle carries less weight.

None of the above.

10. High brake temperatures can result from: *

1 point

Repeated brake use driving down a long steep hill.

Repeated brake use in stop and go traffic.

Severe braking.

All of the above.

11. When a vehicle's brakes do not comply with the Ontario Highway Traffic act and regulations: *

1 point

Only the driver may be charged.

Only the vehicle operator may be charged.

The driver will not be charged.

Both the operator and driver may be charged.

12. Drivers must be careful when conducting an inspection of the air brake system to avoid: *

1 point

Unexpected vehicle movement.

Compressed air exhausting from components.

Moving vehicle parts.

All of the above.

13. When inspecting the brake chambers, the driver must look for: *

1 point

Air leaks, cracks and manufactured holes.

Manufactured air leaks and cracks.

Contaminated brake lining.

Air leaks, cracks and non-manufactured holes.

14. When inspecting the air compressor drive belt, the driver must look for: *

1 point

Loose belt.

Cut belt.

Frayed belt.

All of the above.

15. If a vehicle moves while the spring brakes are applied, the vehicle has: *

1 point

Defective spring brakes.

Properly adjusted service brakes.

A defective brake pedal.

Properly adjusted spring brakes.

16. While draining a vehicle's air tanks, the driver must watch the: *

1 point

Trailer supply line for air exhausting.

Discharge of air from the trailer service line.

Discharge from the air tank for abnormalities.

Function of the governor cut-out.

17. An air tank drain valve that fails to function: *

1 point

Is a normal condition of the air brake system.

Is a defect of the air brake system.

Indicates a defective air compressor governor.

Indicates a defective brake pedal.

18. A reliable method for inspecting brake adjustment is: *

1 point

Measuring the applied pushrod stroke.

Checking air pressure drop on brake application.

Checking for a 90-degree angle when brakes are applied.

Rolling the vehicle forward and applying the brakes.

19. When measuring the applied pushrod stroke, air pressure must be between: *

1 point

690 and 828 kPa (100 to 120 psi).

621 and 690 kPa (90 to 100 psi).

690 and 932 kPa (100 to 135 psi).

414 and 828 kPa (60 to 120 psi).

20. A brake is out of adjustment when: *

1 point

The pushrod stroke exceeds the adjustment limit of the brake chamber.

The angle between the slack adjuster and pushrod is less than 90-degrees.

The angle between the slack adjuster and pushrod is more than 90-degrees.

Air pressure drops more than 55 kPa (8 psi) when brakes are applied.

21. The type of air brake components on most large commercial vehicles are either: *

1 point

Drum or hydraulic brakes.

Air or disc brakes.

Wet or dry brakes.

Drum or disc brakes.

22. The air that exhausts from an air brake system can carry: *

1 point

Dirt and dust

Moisture

Oil

All of the above

23. Air compressors: *

1 point

Are filled with brake fluid.

Generate heat to stop a vehicle.

Force air into a smaller space.

All of the above.

24. Air compressors are powered directly by the engine or using: *

1 point

Belts and pulleys.

Brackets and support.

Chains and sprockets.

Belts and chains.

25. Air compressors are mounted directly onto the engine by using: *

1 point

Pulleys

Brackets and fasteners

Sprockets

Belts and chains

26. A governor controls an air compressor's: *

1 point

Temperature

Speed and pressure

Cut-in and cut-out pressures

Temperature and speed

27. The normal operating pressure range for air brake systems is: *

1 point

414 to 828 kPa (60 to 120 psi)

0 to 1035 kPa (0 to 150 psi)

828 to 932 kPa (120 to 145 psi)

552 to 932 kPa (80 to 145 psi)

28. Driving a vehicle with the air brake system that is outside the normal operation pressure range is: *

1 point

Safe only for a short period of time.

Not safe at any time.

Safe only at high speed.

Unsafe only when going down a hill.

29. When a brake chamber pushrod stroke exceeds the adjustment limit: *

1 point

The spring brakes will still work normally.

Vehicle stopping distances become shorter.

Vehicle braking capacity will increase.

Braking ability is reduced.

30. Air brake systems must comply with the Ontario Highway Traffic Act and regulations: *

1 point

Only when the vehicle is being tested.

Only during an annual safety inspection.

Only when they are inspected by enforcement personnel.

At all times when being driven or operated on any road or highway.

31. When conducting an inspection of the air brake system, the vehicle should be parked securely on a... *

1 point

Hill with the wheels turned towards the curb.

Level surface and in any location.

Hill with the wheels turned away from the curb.

Level surface and in a safe location.

32. When inspecting the brake chambers on each side of a steering axle, the driver must ensure that slack adjusters are: *

1 point

The same effective length and brake chambers are all the same size.

The same effective length and brake chambers are not all the same size.

Not the same effective length and brake chambers are the same size.

Not the same size and brake chambers are not the same effective length.

33. When inspecting the air tanks, the driver must look for: * *

1 point

Loose air compressor governor.

Improperly spliced air line.

Insecurely mounted air tank.

None of the above.

34. To test air pressure build-up time, the engine must be running at... *

1 point

400 to 500 rpm

600 to 900 rpm

2000 to 2100 rpm

1000 to 1500 rpm

35. The low air warning device must activate before air pressure drops to: *

1 point

621 kPa (90psi)

518 kPa (75 psi)

380 kPa (55 psi)

311 kPa (45 psi)

36. An air compressor governor should cut-in approximately 138 to 173 kPa (20 to 25 psi): *

1 point

Below cut-out pressure setting.

Above cut-in pressure setting.

Below cut-in pressure setting.

Above cut-out pressure setting.

37. When a driver finds a brake that is out of adjustment: *

1 point

The vehicle must not be driven or operated on any road or highway.

It must be corrected before entering an inspections station.

It must be corrected at the next annual inspection.

It must be corrected the next time the vehicle is in for service.

38. Repair and re-adjustment of all types of air brakes may be performed by: *

1 point

Licensed drivers

Certified drivers

Certified technicians

Drivers with a valid air brake endorsement

39. Drivers who are certified to re-adjust air brakes may do so on: *

1 point

All commercial vehicles.

Vehicles with manual slack adjusters.

Vehicles with automatic slack adjusters.

Trucks, tractors and buses only.

The compressed air in the air brake system is stored in: *

1 point

The vehicle's air tanks.

The air compressor governor.

The brake chambers.

The air lines and valves.

41. Air tanks must be drained regularly because: *

1 point

This is where moisture and oil collect.

Tanks will develop too much pressure.

The tanks will overheat.

This is where primary and secondary air collect.

42. To check the air pressure in a vehicle's air brake system, a driver... *

1 point

Reads the gauges on the instrument panel.

Makes a full brake application.

Operates the engine at fast idle.

Waits for governor cut-out.

43. Vehicles with air brakes must have air pressure gauges that indicate the pressure in the: *

1 point

Brake chambers

Air compressor

Air compressor governor

Primary and secondary air tanks

44. Safety valves prevent: *

1 point

Overheating of the air tanks.

Draining of the air tanks.

Over-pressure of the air brake system.

Loss of air tanks.

45. When a low air pressure warning device activates, the driver must: *

1 point

Drive the vehicle until brakes come on automatically.

Come to a safe stop as soon as possible.

Replace the warning device.

Drain the moisture out of the supply (wet) tank.

46. An air dryer removes moisture, which is expelled when the: *

1 point

Low air warning device activates.

Driver applies the service brakes.

Compressor reaches cut-out pressure.

Spring brakes are applied.

47. Alcohol evaporators may be used to: *

1 point

Add water to the air brake system to prevent freezing.

Heat the air brake system to help prevent freezing.

Help prevent moisture in the air brake system from freezing.

Remove water vapour from the air brake system.

48. Using anti-lock braking systems (ABS) to prevent the wheels from locking: *

1 point

Causes the brakes to go out of adjustment more easily.

Helps maintain steering control during emergency braking.

Causes poor steering and directional stability in all driving situations.

Can cause loss of steering control.

49. To prevent vehicle movement during an inspection of the air brake system, a driver should use: *

1 point

The service brakes.

The spring brakes.

Wheel chocks or blocks.

The brake pedal.

50. When inspecting brake drums and rotors, the driver must look for: *

1 point

Brake callipers and rotors that are not the same colour.

Broken or cracked brake drums or rotors.

Brake drums or shoes that are not the correct size.

Square ports and markings.

51. When inspecting visible air brake hoses and tubes, the driver must check for: *

1 point

Audible air leaks.

Damaged or worn air lines.

Improper fitting used to connect or repair an air line.

All of the above.

52. To test the tractor protection valve, the driver must check for air exhausting from the: *

1 point

Trailer supply line with the trailer air supply valve open (pushed in).

Trailer supply line with the trailer air supply valve closed (pulled out).

Trailer service line with the trailer supply valve closed (pulled out).

Trailer service line with the trailer supply valve open (pushed in).

53. When testing air pressure build-up time, pressure must build from 587 to 690 kPa (85 to 100 psi) within: *

1 point

1 minute

3 minutes

2 minutes

4 minutes

54. When an air brake system is defective, you must: *

1 point

Drive the vehicle slowly on the highway.

Drive the vehicle to the nearest service station.

Drive the vehicle back to the terminal.

Not operate the vehicle on any road or highway.

55. The brake pedal in an air brake system is used to: *

1 point

Apply vehicle spring brakes.

Raise and lower air brake system pressure.

Apply vehicle service brakes.

Apply trailer service brakes only.

56. Manually operated front-wheel limiting valves are: *

1 point

Used to reduce the force of the service brakes on the front steering axle.

Only found on new vehicles to disable front steering axle brakes.

Used to limit the number of times the brakes can be applied.

Used to reduce the brake force on trailer axle brakes.

57. Air brake chamber pushrod stroke is the result of: *

1 point

Moisture entering the air tanks.

Compressed air entering the air tanks.

Compressed air entering the brake chamber.

Brakes that are out of adjustment.

58. Each air chamber style, type and size has a specific: *

1 point

Colour

Adjustment limit

Mounting position

All of the above

59. Spring brake chambers: *

1 point

Are larger than service brake chambers.

Are smaller than service brake chambers.

Are less likely to be out of adjustment than service brake chambers.

Always have square ports.

60. The part inside a spring brake chamber that can be hazardous is the: *

1 point

Rubber diaphragm

Return spring

Large coil spring

Release pushrod

61. When a spring brake chamber has been disabled by a "caging bolt" or other mechanism: *

1 point

It looks the same to the driver.

The spring brake will still apply.

The service brake will not apply.

The spring brake will not apply.

62. A spring brake control valve is normally: *

1 point

Located in the same position in all commercial vehicles.

Pulled to release and pushed to apply the service brakes.

A toggle-type valve located in the same position in all vehicles.

A push/pull type valve located near the driver.

63. Anti-lock braking systems (ABS) *

1 point

Prevent wheel lock and may reduce steering control.

Cause wheel lock but may not shorten vehicle stopping distance.

Prevent wheel lock but may not shorten vehicle stopping distance.

Cause wheel lock to shorten vehicle stopping distance.

64. Anti-lock braking systems (ABS) use warning indicator lights to indicate: *

1 point

The system temperature.

Wheel skidding.

Malfunctions of the system.

None of the above.

65. When inspecting the foundation brake components, the driver must look for: *

1 point

Brake lining that is not against the drum when the brakes are applied.

Brake lining that is too thin or cracked.

Grease or oil on the brake lining.

All of the above.

66. The air loss rate on a single vehicle (bus, tractor or truck) must not exceed: *

1 point

21 kPa (3 psi) per minute.

41 kPa (6 psi) per minute.

55 kPa (8 psi) per minute.

7 kPa (1 psi) per minute.

67. A properly functioning air brake system: *

1 point

Will lose air at a noticeable rate.

Has many noticeable air leaks.

Will lose air at a noticeable rate when the engine is not running.

Should not have any noticeable air leaks.

68. Air compressor cut-in pressure must never be less than: *

1 point

414 kPa (60 psi)

828 kPa (120 psi)

552 kPa (80 psi)

932 kPa (135 psi)

69. When inspecting the air compressor, the driver must look for: *

1 point

Insecure mounting brackets or fasteners.

Improper governor setting.

Loose air tank brackets or fasteners.

All of the above.

70. When air brake system pressure drops below 414 kPa (60 psi) the spring brakes: *

1 point

Will automatically release.

Will automatically apply.

Must be manually applied.

Must be manually released.

71. When a vehicle's service brakes fail to apply, emergency brakes can be applied by using the: *

1 point

Brake pedal.

Spring brake control valve.

Tractor protection valve.

Trailer hand valve.

72. When a vehicle's brakes are out of adjustment: *

1 point

The spring brakes are not affected.

The spring brakes may not stop or hold a vehicle.

The spring brakes will hold the vehicle stationary.

Service brake performance is not affected.

73. The air brake system on a trailer includes: *

1 point

Air tanks and air compressors.

Air tanks and automatic evaporator valves.

Wet and dry air tanks.

Air tanks and automatic spring brake application.

74. When trailer couplers or "gladhands" are cross-connected: *

1 point

Trailer service and spring brakes will function correctly.

The trailer spring brakes will release and function correctly.

Trailer service and spring brakes will not function correctly.

Trailer service brakes will function correctly.

75. The trailer hand valve is used to: *

1 point

Release the trailer spring brakes.

Apply the trailer spring brakes.

Release the towing vehicle spring brakes.

Apply the trailer service brakes.

76. A vehicle's brakes must do more work when: *

1 point

The vehicle carries less weight.

The vehicle goes slower.

The vehicle carries more weight.

All of the above.

77. When the air loss from an air brake system exceeds the prescribed limits *

1 point

The vehicle must be driven slowly on the highway.

The vehicle may not be driven on any road or highway.

The vehicle must be driven to the nearest service centre.

The vehicle must be driven on only secondary roads.

78. The air loss rate on a towing vehicle with two or more trailers must not exceed: *

1 point

28 kPa (4 psi) per minute.

41 kPa (6 psi) per minute.

55 kPa (8 psi) per minute

7 kPa (1 psi) per minute

79. To test the low air warning device, the ignition switch must be turned on and air pressure must be: *

1 point

Within normal operating range.

Reduced from the normal operating range.

Above 621 kPa (90 psi)

Below 518 kPa (75 psi)

80. The ability of the brakes to stop a vehicle: *

1 point

Is the same for all vehicles.

May be lost when a vehicle is overloaded.

Improves as speed increases.

All of the above.

81. A trailer supply valve is: *

1 point

Located in the same position in all commercial vehicles.

Pulled to release spring brakes and pushed to apply service brakes.

A toggle-type valve that supplies air to the trailer and is located in the same position on all vehicles.

A push/pull type valve located near the driver that supplies air to the trailer.

82. A tractor protection valve: *

1 point

Causes towing vehicle spring brakes to apply in an emergency.

Prevents loss of air out of the towing vehicle.

Causes the trailer service brakes to apply in an emergency.

Prevents air loss from the trailer supply line.

83. A trailer with "spring brake" priority allows the trailer spring brakes to release before *

1 point

Towing vehicle service brakes will operate.

Trailer service brakes will operate.

Trailer spring brakes will release.

Trailer service brakes will release.

84. When the air pressure in the trailer supply line drops below 414 kPa (60 psi): *

1 point

Trailer spring brakes will automatically apply.

Towing vehicle spring brakes will automatically apply.

Trailer spring brakes will automatically release.

Towing vehicle spring brakes will automatically release.

85. To test the spring brakes, the driver should apply them and attempt to move the vehicle by: *

1 point

Applying full engine power in a high gear.

Applying engine power gently in a low gear.

Applying the service brakes in any gear.

Releasing the spring brakes in any gear.

86. A compressor cut-out pressure must be between: *

1 point

621 and 690 kPa (90 to 100 psi)

414 and 828 kPa (60 to 120 psi)

587 and 690 kPa (85 to 100 psi)

690 and 932 kPa (100 to 145 psi)

87. Brake fade can result from: *

1 point

High brake temperatures.

High air compressor temperature.

High air brake system pressure.

Driving at high altitudes.

88. A tractor protection valve is defective if the trailer supply valve is closed (pulled out) and air exhausts from the: *

1 point

Trailer supply line with the brake pedal depressed.

Trailer service line with the brake pedal depressed.

Trailer service line with the brake pedal released.

Trailer supply line with the brake pedal released.

89. Trailer spring brakes must apply automatically when the: *

1 point

Trailer supply valve is opened (pushed in).

Spring brake valve is opened (pushed in).

Trailer supply valve is closed (pulled out).

Trailer hand valve released.

90. Trailer couplers or "gladhands" are used to connect the: *

1 point

Towing vehicle supply line to the trailer service line.

Towing vehicle air brake system to the trailer air brake system.

Towing vehicle service line to the trailer supply line.

Lights on the trailer to the towing vehicle.

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