By practicing with these tests, you can learn the concepts and procedures of operating an air brake system. Additionally, our practice tests are available online, making studying at your own pace and from any location convenient.


Ontario Air Brake Test 02

1 / 30

Which of these can cause the air pressure to drop and so activate the spring brakes?

2 / 30

Which of these is not the type of foundation brake system?

3 / 30

You should ascertain whether a trailer uses a spring brake or service brake priority system by...?

4 / 30

When attaching a trailer, the supply line is usually color-coded what color?

5 / 30

In the majority of air brake systems, the parking and emergency brakes are applied by doing what to the control?

6 / 30

The trailer supply valve will close automatically when air pressure drops below...?

7 / 30

On which of these vehicles are you most likely to find a DD3 Safety Actuator?

8 / 30

You have finished your delivery and unhitched from your trailer. What should you do with the trailer supply valve?

9 / 30

Trailer hand valves can be used for...?

10 / 30

How many connections must be made to join a trailer's brake system to the brake system of the towing vehicle?

11 / 30

Which of these trailers can be towed without waiting for the service brake air tanks to fill?

12 / 30

'S' cam brakes use which sort of system?

13 / 30

Service line couplings are usually color coded which color?

14 / 30

Which of these statements applies to spring brakes?

15 / 30

Trailer service brakes can be operated by...?

16 / 30

Trailer brake subsystems must apply the spring brakes automatically when the trailer supply line pressure drops below...?

17 / 30

If trailer lines are cross connected, which of these may happen with the trailer brakes?

18 / 30

If a spring brake priority trailer loses air to the service brakes, the trailer can only be braked by...?

19 / 30

Trailer brake subsystems supply air...?

20 / 30

If you notice that your brake system has caging bolts on it, what should you do?

21 / 30

To release the spring brakes on a vehicle with a DD3 Safety Actuator, you must operate the control valve and then do what?

22 / 30

What is a 'gladhand'?

23 / 30

A DD3 Safety Actuator has how many air line connections?

24 / 30

When the tractor protection valve is opened, it allows air to...?

25 / 30

The tractor protection valve on towing vehicles is designed to do what?

26 / 30

The spring brake controls are normally what color?

27 / 30

Air brake systems on a trailer have which of these components?

28 / 30

The trailer supply valve is usually operated from the dashboard by a control with a knob of which color?

29 / 30

A caging bolt is used by a technician to do what?

30 / 30

What do the foundation components consist of?

Your score is


Z Endorsement Test

Our free Z endorsement test questions and answers will prepare you to pass Ontario’s official Air Brakes knowledge test. To begin your career in trucking, you must obtain your Ontario Class A or Class D Truck Driver’s Licence. The appropriate CDL endorsements you will need are based on the type of trucking career you plan to pursue and are worried about passing your air brake test. Don’t fret! We have a helpful tip to make the studying process painless and successful. Instead of hitting the books for hours, break up the Air Brake Handbook into smaller, more manageable sections. Not only will this make studying seem less daunting, but you’ll also retain the information faster. And don’t forget to take a well-deserved break between sections – your brain will thank you for the rest. With this advice in mind, you’ll breeze through your air brake test without breaking a sweat.