BC Air Brake Test 3

Driving a commercial vehicle is very different from driving a car. Trucks have different controls and different blind spots. As a commercial vehicle operator, you must travel long distances and face a variety of traffic and weather conditions. You must also be prepared to deal with emergencies such as fires and collisions. Before you can get your commercial driver’s licence in British Columbia, you must study and practice to learn to drive carefully and safely. To get your commercial driver’s licence, you must pass both a written and a practical test. The written test (also known as the truck driver’s licence knowledge exam) has several multiple-choice questions. If you are looking for a practice test before taking the commercial driver’s licence knowledge test, this is the place. This practice test will help you prepare. Please note that this is a sample test and does not replace the official truck driver’s knowledge exam. There are 50 questions with hints and explanations of the correct answer. All questions are based on the official 2025 BC commercial driver’s manual. If you have any questions or comments, please contact us. Good luck!

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correct answers to pass

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BC Driver and Vehicle Services

Official British Columbia driver's manual (2025)

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Explore our rigorous, multi-tiered verification process that ensures each question mirrors the official manual for unparalleled accuracy.

Written by Andrei Zakhareuski Updated over a week ago

At Tests.ca, we understand the importance of reliable and accurate practice tests to help you prepare for your driver's knowledge exam. That's why we've developed a meticulous process to create and continually update our practice questions, ensuring they reflect the most current driving laws and regulations.

Here's an inside look at how we maintain the highest quality in our practice tests.

Content Creation and Verification Process

Alignment with Official Driving Handbooks:
Every question we develop is based on the most recent version of each province's official driving manual. Our team regularly monitors each province's official website for the latest updates to ensure our practice tests are always aligned with the most current information.
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We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation.
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Our in-house editor, Steven, who has extensive experience in driver education, crafts each question with precision. He conducts a thorough review of each question against the official manuals to ensure accuracy.
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Our thorough quality control process ensures that you have access to practice tests that are as accurate and up-to-date as possible. We believe in the power of well-prepared drivers and are dedicated to providing you with the best study tools to help you succeed on your driver's knowledge exam.

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List of questions (classic view)

The air compressor should be inspected only when
For the air brake inspection, what do you check first?
In an S-cam drum brake, which of the following is connected to the brake spider?
A brake shoe is not a part of
Brake chambers are found on
It does not matter if a small amount of oil is discovered during drainage of
Compressed air from the air compressor first goes to the
Compressed air exhaust is
Compressed air entering the brake chambers applies
Evacuating air from the brake chambers will apply
A brake lining that has become contaminated with oil or grease indicates a problem with the
An air line shows signs of wear from rubbing, but there are no leaks because the inner tube is still in good shape. What should you do?
An alcohol evaporator or air dryer can
Which tank is likely to collect the most moisture?
Your vehicle will fail the air tank drain valve test if
There is a split-second delay in activation of _________. There is no delay in activation of _________.
The braking system converts the kinetic energy of the moving vehicle into
When you drain the air tanks, which tank should you drain first?
What is the purpose of the governor?
The air compressor is powered by the
Air pressure monitoring gauges are located on the _________ of the vehicle.
The pushrod stroke occurs when compressed air enters
When you press the brake pedal, the valve underneath the brake pedal ________ to apply the service brakes.
Which of the following is part of a disc brake?
If the low air pressure warning signal comes on, what should you do?
If air is lost in one circuit of a tractor-trailer's dual-circuit system but the compressor and governor are still working properly,
Who is ultimately responsible for the condition of the brakes on a vehicle?
Spring-type parking brakes are held in the released position by
The "Trucks Stop Here – Check Brakes" sign before a steep downgrade is
The distance that a vehicle travels from the time that the vehicle's brakes are applied to the time that the vehicle stops is known as its
At a fast engine idle, the compressor must be capable of building up reservoir pressure from 50 psi to 90 psi in less than
Which of the following statements are true about a foot control valve?
The low air pressure warning device must operate when reservoir air pressure drops below
What is the purpose of the hand valve?
The minimum governor cut-in pressure is
The maximum pressure available at any given time for a full brake application depends on
The most common cause of loss of air between the tractor and the trailer is
In a vehicle equipped with air brakes, the most common cause of loss of braking power is
What maintains normal pressures in the air brake system?
How can you make sure that your brakes are properly adjusted?
How do you apply the parking brakes?
Your vehicle's air compressor is belt driven. How do you check for correct belt tension?
Which of these is not a part of a drum brake?
When brakes become overheated, they also become
What is a "glad hand"?
What function does the alcohol evaporator perform?
To inspect an air brake system, you should wear
When must you chock the wheels of your stopped vehicle?
Finding a small bit of oil during an inspection is NOT serious if it's coming from
When inspecting the brake chambers, you should check for which of the following?