Brake discs are an essential component in a vehicle's braking system. They are also commonly referred to as rotors, and their primary function is to provide friction that allows drivers to slow down or stop their vehicles safely. Brake discs work by converting the mechanical energy of the driver pressing the brake pedal into heat energy through friction with the brake pads. The heat generated from this process helps to dissipate quickly, allowing for smooth and effective stopping power. In summary, brake discs play a crucial role in bringing a vehicle to a stop by converting kinetic energy into thermal energy through friction with brake pads.