Which part prevents the shoes from rotating with the drum?

The anchor pin plays a crucial role in drum brake systems by securing the brake shoes in place. Its primary function is to provide a fixed point around which the shoes can pivot, allowing for effective braking force application when the brake is engaged. When the driver applies the brakes, hydraulic force from the wheel cylinder pushes the shoes outward against the inner surface of the brake drum. The anchor pin prevents the shoes from rotating with the drum, ensuring that the braking force effectively slows or stops the vehicle. Without the anchor pin, the shoes could rotate freely with the drum, rendering the braking system ineffective.