别克凯越2插刹车灯开关96874570，传感器级替换，确保制动信号。

Buick Excelle 2-in-1 Brake Light Switch (OEM 96874570) mounted above brake pedal bracket; directly controls brake signal to ECU and tail lamps. When braking, sends signal immediately; ensures safe driving and proper gear shifting logic. Compatible with multiple Excelle models; installation difficulty: low; estimated labor 15-20 minutes. If brake lights remain on, fail to illuminate, or cannot shift out of Park, switch contacts are worn or jammed; replace promptly.