What must every air brake system be equipped with?

Every air brake system is required to be equipped with an air gauge because it provides the driver with crucial information regarding the pressure within the air brake system. This gauge is vital for ensuring that the air pressure is at a safe and functional level for the operation of the brakes. Maintaining proper brake pressure is essential for safe vehicle operation, as insufficient pressure can lead to brake failure.

While other components like a pressure release valve and a safety shut-off valve may play important roles in the overall functionality and safety of the air brake system, the air gauge is the primary instrument that informs the driver about the current state of the system. Without it, the driver would be unable to monitor brake pressure effectively, increasing the risk of failure in braking performance. Therefore, having an air gauge is a fundamental requirement for ensuring safe and efficient braking.