What is the function of the exhaust port in an air brake system?

The exhaust port in an air brake system serves the essential function of releasing air from the braking system when the brakes are disengaged. When the driver applies the brakes, air pressure is directed to various components, activating the brakes. Once the driver releases the brakes, the exhaust port allows the stored air to escape, depressurizing the system. This action is crucial for resetting the brakes for the next application and ensures that the brake components can return to their normal positions without excessive pressure remaining in the lines.

This function is pivotal as it maintains proper operation of the air brake system, avoiding potential issues such as brake drag or ineffective braking. Understanding this process is vital for drivers, as it ensures their awareness of how the brake system operates and responds to input, leading to safer driving practices.