Air Brake Test - The Drive Test

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2 - Air Brake Test

Practice Test - 2

30 Questions

Passing Marks - 80%

1 / 30

Air brake systems must comply with the Ontario Highway Traffic Act and Regulations:

Only when they are inspected by enforcement personnel

Only during an annual safety inspection

Only when the vehicle is being tested

At all times when being driven or opened on any road or highway

2 / 30

What is the purpose of the double-check valve in air brake systems?

To alternate between primary and secondary circuits

To vent excess air pressure

To speed up governor operation

To maintain air dryer efficiency

3 / 30

When a vehicle's brakes do not comply with the Ontario Highway Traffic Act and regulations:

Only the driver may be charged

Only the vehicle operator may be charged

The driver will not be charged

Both the vehicle operator and the driver may be charged

4 / 30

Anti-lock braking systems (ABS):

Cause wheel lock to shorten vehicle stopping distance

Prevent wheel lock but may not shorten vehicle stopping distance

Cause wheel lock but may not shorten vehicle stopping distance

Prevent wheel lock and may reduce steering control

5 / 30

Wedge brake components include:

Rotors and brake drums

Camshafts and brake callipers

Callipers and rotors

Brake drums and brake shoes

6 / 30

What does an air brake application pressure gauge indicate?

Air tank capacity

Parking brake force

Relay valve cut-off pressure

Service brake chamber pressure

7 / 30

How can drivers recognize a failing air compressor?

Overly sensitive brake pedal response

educed governor cut-out pressure

Excessive air tank moisture

Increased build-up times

8 / 30

What is the purpose of the air compressor governor?

To regulate when the compressor starts and stops

To adjust relay valve timing

To vent excess pressure from tanks

To increase brake chamber efficiency

9 / 30

What is the function of the modulator valve in ABS?

To regulate air tank capacity

To prevent moisture build-up

To increase parking brake efficiency

To control air pressure at each wheel

10 / 30

High brake temperatures can results from:

Repeated brake used in stop and go traffic

All the above

Repeated brake use driving down a long or steep hill

Severe braking

11 / 30

Why is it important to check ABS warning lights during a trip?

To verify parking brake engagement

To monitor brake fluid levels

To check air dryer operation

To ensure the ABS system is functioning properly

12 / 30

The ability of the brakes to stop a vehicle:

All the above

May be lost when a vehicle is overloaded

Is the same for all vehicle weights

Improves as speed increases

13 / 30

When conducting an inspection of the air brake system, the vehicle should be parked currently on a:

Hill with the wheels turned toward the curb

Hill with the wheels turned away from the curb

Level surface and in a safe location

Level surface and in any location

14 / 30

Why is it critical to check air hoses during cold weather?

Moisture evaporates slowly

Valve seals may loosen

Compressors overheat

Cold weakens hose material

15 / 30

What is the purpose of the tractor protection valve?

To regulate air tank pressure

To reduce pushrod stroke

To prevent air loss from the tractor during trailer disconnection

To increase service brake efficiency

16 / 30

When inspecting the brake chambers, the driver must look for:

Contaminated brake lining

Air leaks, cracks, and non-manufacturing holes

Manufactured air leaks and cracks

Air leaks, cracks, and manufactured holes

17 / 30

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

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

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

Not the same effective length and brake chambers are the same

The same effective length and brake chambers are the same size

18 / 30

How does a parking brake control valve operate?

By releasing air from spring brake chambers

By venting air from the wet tank

By reducing air hose vibration

By increasing service brake pressure

19 / 30

How can drivers check slack adjusters during a pre-trip inspection?

Inspect brake hose connections

Observe air pressure gauge fluctuations

Test ABS warning lights

Measure pushrod movement with brakes applied

20 / 30

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

Causes the brakes to go out of adjustment more easily

Causes for steering and directional stability in all driving situations

Help maintain steering control during emergency braking

Can cause loss of steering control

21 / 30

What is the purpose of brake linings in drum brakes?

To increase brake chamber life

To provide friction for stopping

To reduce air pressure

To regulate pushrod movement

22 / 30

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

Brake lining that is too thin or cracked

Grease or oil on the brake lining

All the above

Brake lining is not against the drum when brakes are applied

23 / 30

What is the purpose of the relay emergency valve in trailer systems?

To supply air to parking brakes

To maintain air pressure balance

To apply brakes if the trailer separates

To regulate compressor output

24 / 30

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

Wheel chocks and blocks

The brake pedals

The spring brakes

The service brakes

25 / 30

Inspecting the air tanks, the driver must look for:

Insecurely mounted air tank

Improperly spliced airline

None of the above

Loose air compressor governor

26 / 30

What should be done if the low-pressure warning activates while driving?

Check parking brake operation

Increase engine RPMs

Stop and investigate immediately

Drain air tanks

27 / 30

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

Unexpected vehicle movement

Compressed air exhausting from components

Moving vehicle parts

All the above

28 / 30

What should you observe when testing the emergency brake system?

Brake fluid level in reservoirs

Air dryer purging frequency

Proper hand valve operation

Vehicle stopping with spring brakes applied

29 / 30

Brake fade can result:

High brake temperatures

High air compressors temperature

High air brake system pressure

Driving at high attitudes

30 / 30

How often should air tanks be drained in humid conditions?

Only when water is detected

Monthly

Weekly

Daily

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