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

The main components of the air brake system include the air compressor, air tanks, brake valves, and brake chambers.

The air compressor plays a critical role by generating compressed air, which is essential for the entire operation of the air brake system. It draws in air from the atmosphere and compresses it before directing it into the air tanks. Air tanks serve as storage containers for the compressed air, ensuring that there is sufficient pressure available to operate the brakes when needed.

Brake valves are responsible for controlling the flow of compressed air to the brake chambers. These valves manage how the air is released to activate or release the brakes, allowing for precise control and effective braking performance. Finally, the brake chambers convert the compressed air into mechanical force, enabling the truck's braking system to function effectively by pushing the brake pads against the rotors.

While the other options mention various components, they do not accurately reflect the critical components found in an air brake system. For instance, the mention of fuel tanks and elements like brake pads and rotors relates more to hydraulic braking systems rather than air braking systems. Therefore, understanding the function and interrelationship of the air compressor, air tanks, brake valves, and brake chambers is key to comprehending how air brakes operate in trucks.