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Help CenterBMW 1/2 Series & X1/X2 – Front & Rear Brake Wear Sensors
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Function：
Wear detection & warning: When the brake pad reaches its wear limit, the sensor wire is cut through, breaking the circuit. The ECU detects the open loop and illuminates the dash warning lamp to prompt pad replacement.
Automatic braking (collision mitigation): BMW’s brake-pad sensor is integrated with forward-looking radar/camera units mounted in the front bumper. If an obstacle is detected and the collision risk exceeds the calibrated threshold, the system first issues audible/visual alerts. Should the driver fail to react, it can initiate autonomous emergency braking to reduce impact speed or avoid the collision altogether.
Parameters：
Sensor resistance: ≈ 0.8 Ω when intact (acts like a simple wire). Resistance becomes infinite (∞ Ω) once the wire is severed, triggering the “Replace brake pads” message.
Installation position: Varies by model; e.g. on the 5 Series the wear sensors are fitted to the left-front and right-rear brake pads.
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