What is the term used for the emergency brake in a school bus?

The term "spring brake" refers to a specific type of emergency brake used in larger vehicles, including school buses. This braking system operates by using a set of compressed springs, which engage and apply the brakes automatically when the vehicle's air pressure decreases to a certain level, ensuring that the vehicle remains stationary or slows down in the event of an air system failure.

Spring brakes are critical for safety, as they provide an additional layer of security to prevent the bus from rolling when parked. While the parking brake is also an important component, particularly for keeping the bus stationary when stopped, the spring brake is specifically designed to activate in emergencies or system failures. Understanding this distinction is vital for school bus drivers, as it ensures they know how to effectively use and rely on each braking system in different circumstances.