Ontario MTO Truck Knowledge Practice Test

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Prepare for the Ontario MTO Truck Knowledge Test with our engaging quiz, featuring multiple choice questions, hints, and explanations for each answer. Get ready to ace your exam and ensure a successful driving career!

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What is the most frequent reason vehicles are removed from service by mechanics or inspectors?

Air brakes
Engine failure
Broken windows
Transmission issues

The correct answer is: Air brakes

Vehicles are often removed from service by mechanics or inspectors when their air brakes fail. This is because air brakes are a crucial safety component in vehicles, used to slow and stop heavy vehicles. Engine failure and transmission issues can also lead to removal from service, but these issues may not pose an immediate safety threat. Broken windows, while potentially obstructing visibility, would not directly affect the safe operation of the vehicle. As such, air brakes are the most frequent reason for removal from service by mechanics or inspectors.