What component returns after application by the brake shoe return spring?

The component that returns after application by the brake shoe return spring is the drum brake shoe. When the brakes are applied, the brake shoes press against the inner surface of the brake drum, which creates friction and slows down the vehicle. Once the brake pedal is released, the brake shoe return springs pull the brake shoes back to their original position away from the drum. This action is essential for ensuring that the brakes are ready for the next application.

The other components listed, such as the wheel cylinder, brake pad, and rotating disc, serve different functions within the braking system. The wheel cylinder operates in hydraulic brake systems, and the brake pad is part of disc brake systems, while the rotating disc refers to the piece that the brake pads press against in disc brakes. Therefore, they are not directly related to the return mechanism initiated by the brake shoe return springs in drum brake systems.