Brake disc offer better stopping performance because the disc is more readily cooled.
The brake disc is the component of a disc brake against which the brake pads are applied. The material is flake graphite cast iron typically Grey Iron for automotive brake disc. The design of the disc varies from simply solid and ventilated. The weight and power of the vehicle determines the need for ventilated discs. The "ventilated" disc design helps to dissipate the generated heat and is commonly used on the more-heavily-loaded front discs. Brake disc offer better stopping performance because the disc is more readily cooled.