Ontario Commercial Drivers License Air Brakes Practice Test 2

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Ontario Air Brakes Practice Test 2

A 20 question practice test to help prepare you for your air brakes knowledge test in Ontario

1 / 20

Why is it important to know where your air system releases air pressure from?

In case anyone ever asks

So you're not suprised

Because it can be dangerous

Because you should know your truck

2 / 20

What powers the air brakes air compressor system?

The trucks engine

Overhead wires

The rotation of the wheels

The battery

3 / 20

The spring brake is designed for which situation?

Skids and parking

Parking and emergencies

Loading skids into the trailer

Skids and emergencies

4 / 20

Doing this will put unnecessary strain on your vehicles braking system.

Driving too slow

Proper maintenance

Exceeding the vehicles weight limit

Driving the speed limit

5 / 20

What does a governor do in an air brake system?

Limits the speed by using automatic braking

Regulates the air pressure

Tells the other brakes what do to

Regulates the tire pressure

6 / 20

Which can contaminate a brake systems air lines?

Dust

Dirt

Water and salt

Grease and oil

7 / 20

Any commercial vehicle with air brakes must not lose system pressure with the brakes applied at a rate of more than?

50 kPa / minute

21 kPa / minute

19 kPa / minute

37 kPa / minute

8 / 20

What happens to the air valve when you press down the brake?

The air valve closes, leaving the brake pressure the same

The air valve is operated by the gas pedal

The air valve signals the compressor to turn on

The air valve opens letting more air into the brakes

9 / 20

The air system pressure range must be between _________.

690 kPa (100 psi) and 1380 kPa (200 psi)

413 kPa (60 psi) and 828 kPa (120 psi)

551 kPa (80 psi) and 1000 kPa (145 psi)

483 kPa (70 psi) and 1138 kPa (165 psi)

10 / 20

Where is the air pressure gauge for the air brake system?

On each wheels brake

Beside the air compressor

Beside the supply tank

On the vehicle dashboard

11 / 20

Which of these is not part of an air brake system?

Shoe

Rotors

Lining

Drum

12 / 20

Manufactures recommend draining moisture and oil in an air system on a _______ basis.

Monthly

Daily

Weekly

Quarterly

13 / 20

When inspecting an air brake system, the person inspecting should wear?

Shorts and Crocs

Sandals and shorts

Dust mask, safety glasses

Steel toe boots, safety glasses, hard hats

14 / 20

Most air brake systems will use automatic valves to?

Reduce pressure at the front wheels

Increase pressure at the front wheels

Reduce pressure at the back wheels

Increase pressure at the back wheels

15 / 20

Spring brakes will begin to apply when the pressure starts to drop below?

413 kPa (60 psi)

380 kPa (55 psi)

242 kPs (35 psi)

551 kPa (80 psi)

16 / 20

What should you do when the air brakes low pressure warning comes on?

Call the police to let them know

Check it at the nearest garage

Stop safely and immediately

Slow down but keep driving

17 / 20

What is the service brake used for?

Emergency braking

None of these

Normal braking

Drifting

18 / 20

The best way to reduce rough and abrupt braking is to?

Wear a helmet in the cab

Drive on highways only

Follow other vehicles at a safe distance

Ride the brake pedal all the time

19 / 20

What is the "cut-out" level?

The pressure level that triggers the governor to cut off the air compressor

The safest pressure level you can turn off the truck at

The maximum speed the air brakes can stop at

The pressure level that triggers the governor to turn on the air compressor

20 / 20

Which of these vehicles would usually have an air brake system?

A pickup truck

A school bus

A hearse

A compact car

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We do our best to keep the questions current and accurate. The testing centres may change the questions on the knowledge tests at any time. Always be prepared for surprises.

Many of the answers to the questions can be found in the driver hand books or learning materials your province provides.

DISCLAIMER: CDHQ is not affiliated with DriveTest or the MTO. These practice tests should not be considered official tests and you are not granted a license for completing them. Our tests are simply a practice tool to help prepare yourself for the real test.