How does the spring brake engage?

The spring brake engages automatically when air pressure is lost. This is a critical safety feature in air brake systems. The spring brake functions by utilizing large springs that are compressed during normal operation when air pressure is present. If there is a loss of air pressure, these springs are designed to expand, which engages the brakes.

This automatic function is crucial because it helps to stop the vehicle in case of a failure in the air brake system. It ensures that the vehicle remains under control and minimizes the risk of accidents due to brake failure. The concept behind this design is based on the principle of fail-safe mechanisms, where the brakes will engage to prevent movement if the system experiences a loss of pressure. This is vital for heavy commercial vehicles that rely on air brakes for safe operation on the road.