Brake discs are an important part of the braking system. If the braking system is to always slow down the vehicle safely and comfortably - bringing it to a complete stop if necessary - the brake discs must combine with the brake pads to generate braking torque (braking force).

Disc brakes are safety-critical automotive components that must meet stringent cost and environmental requirements. Drivers often assess the performance of a vehicle's braking system based on the "feel" of the brake pedal.

The significance of the braking system in any vehicle is enormous. Its main function is to reduce the speed of a moving vehicle or to bring it to a complete stop.

Brake discs are an important part of the braking system. If the braking system is to always slow down the vehicle safely and comfortably - bringing it to a complete stop if necessary - the brake discs must combine with the brake pads to generate braking torque (braking force).

Although nearly all passenger cars today are capable of stopping maximum speed in a single pass at or near the limits of tire adhesion, most passenger cars, light trucks and some sports cars have braking systems that are inadequate for hard or sporty driving or towing.