BMW M2 2015–2018 — technical service bulletin
Bulletin B340615 · NHTSA communication 10135033 · issued Feb 1, 2018
Technical service bulletin
communication type
Service Brakes
component
2015–2018
model years
9
vehicle entries
Official summary
Grinding Noise from Rear Brakes: Pebbles, road grit, or other foreign materials caught between the brake protection plate and the brake disc may cause a disturbing noise in the rear axle area.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.