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SEN-2BWS0161• Rear• Disc Brake Pad Wear Sensor
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GeoBrakes stocks OEM-grade disc brake pad wear sensors confirmed to fit the Bmw 120i, the single-use probe components that trigger your 120i dashboard warning light the moment your brake pads approach minimum thickness. Every sensor is direct-fit for the Bmw 120i
Standard/OE$18.03
10 items in stock
Select your vehicle to see compatible products and accurate pricing
Standard/OE$17.61
10 items in stock
Select your vehicle to see compatible products and accurate pricing
Standard/OE$16.39
10 items in stock
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A disc brake pad wear sensor on the Bmw 120i is your vehicle's advance warning system for brake pad replacement. It eliminates the need to rely on audible squealing from your 120i to know your pads are getting thin, instead triggering a dashboard warning light at a preset minimum thickness on the Bmw 120i, giving you time to plan the replacement before the pads wear through to the metal backing plate. Replacing a triggered sensor with every 120i pad change is the only way to keep that early-warning system working for the next service interval.
The wear sensor on the Bmw 120i is a small probe embedded in or clipped to the brake pad. When the 120i pad wears down to the replacement threshold, the probe contacts the rotor surface. This contact creates a circuit change that signals the Bmw 120i ABS or brake control module, illuminating the brake warning light. Once the probe on the Bmw 120i has contacted the rotor, it is destroyed and cannot be reused. It is a single-use component by design on the 120i.
Installing fresh brake pads on the Bmw 120i without fitting a new wear sensor defeats the entire purpose of having a brake monitoring system on your 120i. A previously triggered sensor probe is worn through and has no remaining material to detect the next set of 120i pads wearing down. From day one of the new Bmw 120i brake pads, the warning system is non-functional without a new sensor.
Wear sensor compatibility for the Bmw 120i is more exacting than most brake parts. The probe length, contact resistance specification, and connector design must all match the 120i brake monitoring circuit precisely. A wrong sensor triggers Bmw 120i warnings at the wrong pad thickness, or not at all. Every sensor in the GeoBrakes catalogue is sourced to original equipment probe and connector specifications for the Bmw 120i, with front and rear positions listed separately.
Do I need to replace the brake pad wear sensor every time I change pads on my Bmw 120i?
Yes, on Bmw 120i vehicles equipped with electronic wear sensors. The sensor probe on your 120i is a single-use component. Once it has contacted the rotor and triggered the 120i warning light, the probe is consumed. Always replace the Bmw 120i sensor during every pad change.
Does my Bmw 120i have electronic brake pad wear sensors?
Many vehicles use a mechanical wear indicator instead of electronic sensors. Check your Bmw 120i owner's manual or use the GeoBrakes vehicle selector to confirm whether your 120i uses an electronic pad monitoring system.
Can a faulty wear sensor keep the brake warning light on my Bmw 120i on after new pads are installed?
Yes. If the Bmw 120i wear sensor from a previous brake service was not replaced, or if the probe has been damaged on your 120i, the brake warning light will remain on even with new pads. Replacing the 120i sensor will clear the fault and restore normal operation.