Ontario Commercial Drivers License Air Brakes Practice Test 4

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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

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

2 / 20

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

3 / 20

Cut out pressure level must never exceed __________.

4 / 20

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

5 / 20

Correct belt tension for an air compressor can be determined by

6 / 20

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

7 / 20

What function does the alcohol evaporator perform?

8 / 20

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

9 / 20

Which colour represent the trailer supply line?

10 / 20

Activation of trailer spring brakes can be checked by?

11 / 20

What is a "glad hand"?

12 / 20

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

13 / 20

When brakes become overheated they also become?

14 / 20

Why are their two service tanks?

15 / 20

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

16 / 20

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

17 / 20

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

18 / 20

What is an ABS system?

19 / 20

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

20 / 20

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

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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.