The R1 Concepts drilled black brake rotor for 1990–1997 Audi S4 (rear left) is a direct-fit replacement that restores the vehicle's braking surface with a drilled face and black finish. Specified for the rear left position across those S4 years, it matches the original rotor mounting pattern and dimensions for correct fit during routine brake service.
R1 90-97 Audi S4 Rear Left Drilled Black Brake Rotor