Which component is crucial for controlling air flow in the AFM brake system?

The air flow indicator plays a critical role in the AFM brake system by providing visual feedback about the flow of air within the braking system. It helps personnel monitor the air pressure and flow conditions, which are essential for the effective operation of the brakes. By indicating whether air is flowing correctly through the system, it allows for the early detection of issues such as leaks or blockages, leading to timely adjustments and ensuring optimal braking performance.

While other components like the brake cylinder, equalizing reservoir, and PC switch are important for the overall functionality of the braking system, they do not serve the specific purpose of monitoring air flow. The brake cylinder is responsible for applying the braking force, the equalizing reservoir helps maintain pressure levels, and the PC switch contributes to controlling braking operations, but none of them provide the critical real-time feedback on air flow that is essential for operational safety and efficiency.