Rev Up for the Ontario MTO Truck Knowledge Test 2026 – Haul Your Success to the Finish Line!

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.