34116792221 BMW BRAKE DISC

A ventilated brake disc from BMW, the Brake Disc is intended for front use in specific models like the 428i xDrive and 430i xDrive. It has a diameter of 330mm and a thickness of 24mm. This part is designed to work with xdrive systems without M Sport brakes or with M Sport packages. Brake discs, or rotors, are metallic circular components integral to a vehicle’s braking system, mounted on the wheel hubs. They function as a friction surface for brake pads, converting kinetic energy into thermal energy via clamping force to decelerate or stop wheel rotation. Discs are typically constructed from gray cast iron, though carbon ceramic and composite materials are also utilized for performance applications. Key characteristics include diameter, thickness, venting style (solid, vented, drilled/slotted), and rotor hat offset. Variation exists between solid, vented, and cross-drilled/slotted designs, impacting heat dissipation and performance characteristics.