BMW M2 2015–2018 — technical service bulletin
Bulletin B340615 · NHTSA communication 10146742 · issued Dec 1, 2016
Technical service bulletin
communication type
Service Brakes
component
2015–2018
model years
10
vehicle entries
Official summary
Grinding Noise from Rear Brakes. Pebbles, road grit, or other foreign materials can get caught in between the brake protection (backing) plate and the brake disc(s), this may cause a disturbing noise in the rear axle area while driving.
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.