What are the structures of the brake disc?

Disc brake is mainly composed of brake caliper, brake disc, piston and brake block. Brake disc is the core component of disc brake, usually made of metal materials, working with the brake block friction to produce braking force. The structure of the brake disc is varied, including flat type, punched type and scribing type. The brake caliper is a component used to clamp the brake disc, usually controlled by a hydraulic system.