The R1 Concepts drilled brake rotor for 1990–1991 Mazda 929 (rear, left) is a black-finish, drilled replacement rotor designed to aid heat dissipation and preserve pad contact under braking. It replaces the left rear rotor to restore consistent stopping performance on the specified vehicle and is suitable for standard brake service and component refresh projects.

R1 90-91 Mazda 929 Rear Left Drilled Black Brake Rotor