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Based on 2025 QC commercial driver's licence manual
Updated for August 2025
QC Air Brake Test 6
Navigating the roads of Quebec, from the cityscapes of Montreal to the picturesque regions of Charlevoix, demands mastery of air brakes. This practice test containing 50 questions is aligned with Quebec's official commercial driver's manual and helps you start strong.
Perfect for first-time and renewal commercial applicants, and those adding endorsements
Triple-checked for accuracy
About this test
5 out of 5 • 1 votes
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
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What kind of supplementary brake is most commonly found in the market?
To connect brake hose couplers, they need to be joined at what angle and then rotated until the hoses align?
When multiple vehicles are coupled together, how many brake hose couplers does each vehicle possess?
High heat produced by the friction between linings and drums or discs can cause the linings to do what?
If you engage the parking brake control knob, what happens to the wheels of the tractor and the wheels of the trailer or semi-trailer?
What do brake drums do when exposed to high temperatures?
When do brake linings usually diminish in their efficacy?
Engine brakes and retarders are triggered by what means?
Regardless of the kind of engine brake or retarder installed in your vehicle, the braking power always applies to which wheels?
What is the most frequent type of brake found on heavy vehicles?
Some vehicle manufacturers surpass this standard and calibrate the low air pressure warning threshold at what pressure to provide the driver more warning time?
When you double your speed, how does this impact the braking power required?
To relieve overheating, you can...
If the load doubles the entire weight of your vehicle, the stopping or braking distance is...
What colour are the brake hoses that supply air to the trailer brake chambers for the service brakes?
How long does it typically take for air to traverse the system?
To bring a vehicle to a halt in the same distance when its weight has been doubled, the braking force should be what?
What powers the compressor in a vehicle's air brake system?
Where does a compressor pump the air in a vehicle's braking system?
What is leveraged to gain a mechanical advantage in a braking system?
What causes the wheels to stop spinning in a braking system?
What could result from improperly adjusted brakes on one or two wheels of a vehicle?
What influences the distance needed to bring a vehicle to a complete stop?
What is the device that provides compressed air in a brake system known as?
What is a common device used to obtain a mechanical advantage in braking systems?
If a vehicle's compressor is belt-driven, what should you inspect the belts for?
What term is used to denote air that has been forced into a smaller space?
What is transmitted through an air brake system using compressed air?
Where does the heat generated from the friction between brake drums and linings go?
Which statement is untrue about the stopping distance?
In an air brake system, what does the unloading stage signify?
If a vehicle's speed is doubled, by how much must the braking force be increased to stop in the same distance?
What is the optimal operating temperature for most brake linings?
Approximately how long does it take from identifying a hazard to applying the brakes?
What is the maximum operating temperature for most brake linings?
Above what pressure will the compressor not have to pump air in the system?
The compressor must start pumping air into the system by the time that air pressure falls to
Which of the following is not one of the main components in a basic air brake system capable of stopping a vehicle?
Overheating in brakes could lead to what adverse condition?
When both the weight and speed of a vehicle are doubled, the braking force must be adjusted by what factor to stop in the same distance?
What term is used to describe the time taken for air to travel through a properly maintained air brake system?
When brakes generate heat, where does this heat eventually go?
Which component controls when the compressor pumps air by monitoring the minimum and maximum air pressure in the system?
What does the friction between brake drums and linings produce in a braking system?
What is the determining factor for the amount of heat the brake drums can absorb?
What does the term loading stage signify in an air brake system?
Why is the sensation different when operating air treadles compared to hydraulic brakes?
What is the consequence of not maintaining slack adjusters within their specified limits?
What are the alternate names for the primary and secondary reservoirs in an air brake system?
What accumulates at the bottom of the supply reservoir in an air brake system?
What kind of supplementary brake is most commonly found in the market?
To connect brake hose couplers, they need to be joined at what angle and then rotated until the hoses align?
When multiple vehicles are coupled together, how many brake hose couplers does each vehicle possess?
High heat produced by the friction between linings and drums or discs can cause the linings to do what?
If you engage the parking brake control knob, what happens to the wheels of the tractor and the wheels of the trailer or semi-trailer?
What do brake drums do when exposed to high temperatures?
When do brake linings usually diminish in their efficacy?
Engine brakes and retarders are triggered by what means?
Regardless of the kind of engine brake or retarder installed in your vehicle, the braking power always applies to which wheels?
What is the most frequent type of brake found on heavy vehicles?
Some vehicle manufacturers surpass this standard and calibrate the low air pressure warning threshold at what pressure to provide the driver more warning time?
When you double your speed, how does this impact the braking power required?
To relieve overheating, you can...
If the load doubles the entire weight of your vehicle, the stopping or braking distance is...
What colour are the brake hoses that supply air to the trailer brake chambers for the service brakes?
How long does it typically take for air to traverse the system?
To bring a vehicle to a halt in the same distance when its weight has been doubled, the braking force should be what?
What powers the compressor in a vehicle's air brake system?
Where does a compressor pump the air in a vehicle's braking system?
What is leveraged to gain a mechanical advantage in a braking system?
What causes the wheels to stop spinning in a braking system?
What could result from improperly adjusted brakes on one or two wheels of a vehicle?
What influences the distance needed to bring a vehicle to a complete stop?
What is the device that provides compressed air in a brake system known as?
What is a common device used to obtain a mechanical advantage in braking systems?
If a vehicle's compressor is belt-driven, what should you inspect the belts for?
What term is used to denote air that has been forced into a smaller space?
What is transmitted through an air brake system using compressed air?
Where does the heat generated from the friction between brake drums and linings go?
Which statement is untrue about the stopping distance?
In an air brake system, what does the unloading stage signify?
If a vehicle's speed is doubled, by how much must the braking force be increased to stop in the same distance?
What is the optimal operating temperature for most brake linings?
Approximately how long does it take from identifying a hazard to applying the brakes?
What is the maximum operating temperature for most brake linings?
Above what pressure will the compressor not have to pump air in the system?
The compressor must start pumping air into the system by the time that air pressure falls to
Which of the following is not one of the main components in a basic air brake system capable of stopping a vehicle?
Overheating in brakes could lead to what adverse condition?
When both the weight and speed of a vehicle are doubled, the braking force must be adjusted by what factor to stop in the same distance?
What term is used to describe the time taken for air to travel through a properly maintained air brake system?
When brakes generate heat, where does this heat eventually go?
Which component controls when the compressor pumps air by monitoring the minimum and maximum air pressure in the system?
What does the friction between brake drums and linings produce in a braking system?
What is the determining factor for the amount of heat the brake drums can absorb?
What does the term loading stage signify in an air brake system?
Why is the sensation different when operating air treadles compared to hydraulic brakes?
What is the consequence of not maintaining slack adjusters within their specified limits?
What are the alternate names for the primary and secondary reservoirs in an air brake system?
What accumulates at the bottom of the supply reservoir in an air brake system?
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