Air Brake Test Ontario - The Drive Test

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1 - Air Brake Test

Practice Test - 1

30 Questions

Passing Marks - 80%

1 / 30

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

Loose belt

Cut belt

Frayed belt

All the above

2 / 30

A tractor protection valve:

Prevents air loss from the trailer supply line

Causes the trailer service brakes to apply in an emergency

Causes towing vehicle spring brakes to apply in an emergency

Prevents loss of air out of the towing vehicle

3 / 30

How does ABS improve braking performance?

By preventing wheel lockup during hard braking

By increasing pushrod efficiency

By reducing brake fade over time

By venting excess air pressure

4 / 30

What should be done if the parking brake fails to engage?

Inspect relay valve timing

Adjust pushrod stroke

Drain wet tank moisture

Check spring brake chambers for defects

5 / 30

Why is it critical to check air hoses and fittings during a pre-trip inspection?

To verify governor adjustments

To increase brake chamber life

To reduce compressor wear

To prevent air leaks and ensure proper connections

6 / 30

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

Broken or cracked brake drums or roots

Brake callipers or rotors that are not the same color

Brake drums or shoes that are not the correct size

Square parts and marking

7 / 30

What is the primary safety function of spring brakes?

To increase service brake power

To reduce brake pedal travel

To regulate air pressure in tanks

To act as a parking and emergency brake

8 / 30

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

Towing vehicle spring brakes will automatically release

Trailer spring brakes will automatically apply

Trailer spring brakes to automatically release

Towing vehicle spring brakes will automatically apply

9 / 30

How often should drivers inspect slack adjusters?

Only when braking performance decreases

Monthly

Weekly

During every pre-trip inspection

10 / 30

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

All commercial vehicles

Trucks, tractors and buses only

Vehicles with manual slack adjusters

Vehicles with automatic slack adjusters

11 / 30

What is the purpose of brake drums in the air brake system?

To provide a surface for brake shoe friction

To regulate air compressor output

To vent air from the system

To reduce pushrod stroke

12 / 30

What component ensures balanced braking in a dual-circuit system?

Proportioning valve

Quick-release valve

Relay valve

Safety valve

13 / 30

How should a driver verify air pressure build-up time?

Time the pressure increase from 85 to 100 psi

Observe parking brake operation

Check governor cut-in timing

Test ABS functionality

14 / 30

A vehicle's brakes must do more work when:

The vehicle goes slower

The vehicle carriers less weight

All the above

The vehicle carriers more weight

15 / 30

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

Certified drivers

Certified technicians

Drivers with a valid air brake endorsement

Licence drivers

16 / 30

Why is it essential to inspect brake drums regularly?

To prevent over-lubrication

To verify valve alignment

To detect cracks or excessive wear

To monitor air tank capacity

17 / 30

What action should be taken if brake fade is detected?

Drain air tanks immediately

Reduce brake use and allow cooling

Increase engine braking

Adjust slack adjusters

18 / 30

When a trailer service brakes fail to apply, the trailer spring brakes can applied by using:

Tractor protection valve

Brake pedal

Trailer supply valve

Trailer hand valve

19 / 30

'S' cam brake components include:

Camshafts and brake shoes

Callipers and rotors

Camshafts and brake callipers

Rotors and brake drums

20 / 30

Anti-lock braking system (ABS) use warning indicator lights to indicate:

Wheel skidding

None of the above

The system temperature

Malfunctions of the system

21 / 30

A trailer with 'spring brake' priority allows the trailer spring brakes to release before:

Trailer service brakes will release

Trailer service brakes will operate

Towing vehicle service brakes will operate

Trailer spring brakes will release

22 / 30

A brake having an exposed pushrod is out of adjustment when:

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

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

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

The pushrod stroke exceeds the adjustment limit of the brake chamber

23 / 30

How can drivers test the tractor protection system?

Observe brake pedal travel

Disconnect the trailer and observe air loss

Check ABS warning lights

Measure air pressure drop during braking

24 / 30

What is the function of a quick-release valve?

To speed up brake release and prevent drag

To increase brake chamber pressure

To reduce air tank fluctuations

To regulate ABS operation

25 / 30

The low air warning device must active before air pressure drops to:

518 kPa (75 psi)

621 kPa (90 psi)

380 kPa (55 psi)

311 kPa (45 psi)

26 / 30

Why is it important to monitor air tank pressure gauges?

To prevent spring brake over-application

To detect valve misalignment

To observe ABS functionality

To ensure consistent air pressure for brake operation

27 / 30

What happens if the air compressor fails during operation?

The ABS system shuts down

The relay valve stops functioning

The air tanks supply reserve air for braking

The parking brakes automatically engage

28 / 30

When inspecting visible air brake hoses and tubes, drivers must check for:

Audible air leak

Improper fitting used to connect or repair an airline

All the above

Damaged or worn airline

29 / 30

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

3 minutes

2 minutes

1 minute

4 minutes

30 / 30

What is the function of the emergency brake system?

To prevent wheel lockup

To increase trailer stability

To stop the vehicle in case of service brake failure

To regulate air dryer operation

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174 Questions Practice Test