Ontario Commercial Drivers License Air Brakes Practice Test 4

Commercial Driver HQ is a website focused on helping new commercial drivers in all provinces and territories in Canada.

Our FREE practice tests are designed to help you succeed when it comes time to write the real test.

Each license type has 5 tests to help you study and become familiar with the rules and regulations of commercial driving. The tests are not identical to the license test you will need to pass, but the questions are similar to what you will find on the real deal.

Compatible on desktop, mobile, and tablet, you can take these tests anywhere you have internet access.

Take the practice test!

0%
Created by Commercial Driver HQ

Ontario Air Brakes Practice Test 4

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

1 / 20

Who can perform adjustments and maintenance on your air brake system?

2 / 20

How long should it take for the air pressure to rise from 587kPa to 690 kPa after the pressure had fallen below 552 kPa?

3 / 20

What is a "glad hand"?

4 / 20

What function does the alcohol evaporator perform?

5 / 20

What can cause the air pressure in the air brake system to drop?

6 / 20

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

7 / 20

Activation of trailer spring brakes can be checked by?

8 / 20

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

9 / 20

What is the most frequent reason a vehicle is removed from service?

10 / 20

Why are their two service tanks?

11 / 20

Cut out pressure level must never exceed __________.

12 / 20

How do you engage the emergency / parking brake on most air brake systems?

13 / 20

Which colour represent the trailer supply line?

14 / 20

Correct belt tension for an air compressor can be determined by

15 / 20

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

16 / 20

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

17 / 20

When brakes become overheated they also become?

18 / 20

What is an ABS system?

19 / 20

A warning system must alert the driver when the pressure drops below?

20 / 20

What is not a factor in how well your air brake system works?

Thanks for taking the practice test!

Enter your info to sign up for our mailing list or click "See Result" to move on.

Your score is

The average score is 87%

0%

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.