What causes the clicking sound when releasing the brake during auto start-stop?

[IslaFitz]

It's normal for new cars during the break-in period. There are multiple reasons that may cause abnormal brake noises, such as rust or large metal particles. As long as it doesn't affect braking performance, it's not a concern. Additional information: Engine Auto Start-Stop: Engine auto start-stop is a system that automatically shuts off the engine when the vehicle comes to a temporary stop (e.g., at traffic lights) during driving. The system automatically restarts the engine when it's time to move forward again. Working Principle: The start-stop system works by detecting when the vehicle stops due to traffic congestion or at intersections. When the driver presses the brake pedal and shifts to neutral, the Start/Stop system automatically checks three conditions: the engine is idling in neutral; wheel speed sensors from the anti-lock system show zero rotation; and the electronic battery sensor indicates sufficient energy for the next start. When all three conditions are met, the engine automatically stops.