Zimmermann Disc Brake Rotor - 100337820: Zimmermann Disc Brake Rotor is a high quality, lightweight rotor designed for superior braking performance and long service life. The rotor is manufactured with a special alloy that helps to dissipate heat quickly and evenly, reducing brake fade and increasing pad life. The rotor features a directional curved vane design that improves air flow and cooling, and is designed for use with most popular vehicle makes and models.