Ontario MTO Truck Knowledge Practice Test

Once your vehicle is underway, you should check your brakes within 15 meters (50 feet). This distance allows you to ensure your brakes are functioning properly and that you are able to stop safely if needed. Checking your brakes within this distance helps you to maintain control of your vehicle and to prevent accidents on the road.

Options A, B, and C are incorrect because they do not provide a safe distance to properly check your brakes once your vehicle is in motion. Checking your brakes too early may not give you an accurate assessment of their functionality, while checking them too late may result in a dangerous situation.