Manitoba Airbrake Practice Exam

How is an air brake system activated in a vehicle?

1. By pulling a lever

2. By pressing the brake pedal

3. By turning a switch

4. By releasing a clutch

The correct answer is: By pressing the brake pedal

An air brake system in a vehicle is activated primarily by pressing the brake pedal. When the brake pedal is pressed, it initiates a series of actions that allow compressed air to flow through the system. This compressed air is then used to engage the brake chambers located at each wheel. The interaction of the pneumatic pressure with the brake components causes the brakes to engage and slow down or stop the vehicle. This method of activation is fundamental to the function of air brake systems, particularly in larger vehicles like buses and trucks, which rely on air pressure to operate efficiently. The design of air brake systems is such that they require a direct mechanical or pneumatic action, which the brake pedal provides, as opposed to other methods like levers or switches that do not directly link to the primary function of applying the brakes.