This part is listed by BMW as BMW part number 34356877085 (34-35-6-877-085) and is described as OEM Front Brake Pad Wear Sensor for G29 Z4 30i, M40i (2019, 2020, 2021+).
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BMW Fitments:
Z Series
G29 Z4 (2019-2025) > Z4 M40i
G29 Z4 (2019-2025) > Z4 sDrive30i