Rear Left Brake Rotor - 2011 528i

When junkyard hunting for a 2011 BMW F10 528i rear left brake rotor, target 2010-2016 5-Series sedans with standard 18-inch or smaller wheels. The correct rotor carries BMW part number 34 21 6 850 471 (superseding 34 21 6 777 171) and measures 330mm x 20mm with directional cooling vanes—critical for left-side mounting. Inspect the hat section for stress cracking around the wheel bolt holes and measure minimum thickness (19.4mm service limit). Installation requires a T50 Torx bit for the retaining screw and activating the electric parking brake service mode via diagnostic tool or manual override to retract the caliper piston. Common failures include lip formation on the outer edge and corrosion-induced pulsation; always replace the securing screw (07 11 9 905 132) and apply anti-seize to the hub contact surface to prevent future seizing.