BMW M2 2015–2022 — technical service bulletin
Bulletin B340921 · NHTSA communication 10233158 · issued Feb 1, 2023
Technical service bulletin
communication type
Service Brakes
component
2015–2022
model years
21
vehicle entries
Official summary
A turbine-like noise can be heard from the rear axle while deceleration during the first 300 miles of operation when braking from low speed.
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.