BMW's have a reputation as a leader in its class, in part due to its exceptional braking. But when the discs become worn and thin, their effective performance diminishes. We recommend replacement with Zimmermann brake discs. Zimmermann is an original equipment supplier of braking components to BMW, and come treated with their special 'Z-Coat' anti-corrosion technology that prevents the usual unsightly surface rust from appearing on the hubs. Made in Germany.