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SEN-2BWS0172• Rear• Disc Brake Pad Wear Sensor
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GeoBrakes stocks OEM-grade disc brake pad wear sensors confirmed to fit the Mercedes Benz R550, the single-use probe components that trigger your R550 dashboard warning light the moment your brake pads approach minimum thickness. Every sensor is direct-fit for the Mercedes Benz R550
Standard/OE$6.96
10 items in stock
Select your vehicle to see compatible products and accurate pricing
A disc brake pad wear sensor on the Mercedes Benz R550 is your vehicle's advance warning system for brake pad replacement. It eliminates the need to rely on audible squealing from your R550 to know your pads are getting thin, instead triggering a dashboard warning light at a preset minimum thickness on the Mercedes Benz R550, giving you time to plan the replacement before the pads wear through to the metal backing plate. Replacing a triggered sensor with every R550 pad change is the only way to keep that early-warning system working for the next service interval.
The wear sensor on the Mercedes Benz R550 is a small probe embedded in or clipped to the brake pad. When the R550 pad wears down to the replacement threshold, the probe contacts the rotor surface. This contact creates a circuit change that signals the Mercedes Benz R550 ABS or brake control module, illuminating the brake warning light. Once the probe on the Mercedes Benz R550 has contacted the rotor, it is destroyed and cannot be reused. It is a single-use component by design on the R550.
Installing fresh brake pads on the Mercedes Benz R550 without fitting a new wear sensor defeats the entire purpose of having a brake monitoring system on your R550. A previously triggered sensor probe is worn through and has no remaining material to detect the next set of R550 pads wearing down. From day one of the new Mercedes Benz R550 brake pads, the warning system is non-functional without a new sensor.
Wear sensor compatibility for the Mercedes Benz R550 is more exacting than most brake parts. The probe length, contact resistance specification, and connector design must all match the R550 brake monitoring circuit precisely. A wrong sensor triggers Mercedes Benz R550 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 Mercedes Benz R550, with front and rear positions listed separately.
Do I need to replace the brake pad wear sensor every time I change pads on my Mercedes Benz R550?
Yes, on Mercedes Benz R550 vehicles equipped with electronic wear sensors. The sensor probe on your R550 is a single-use component. Once it has contacted the rotor and triggered the R550 warning light, the probe is consumed. Always replace the Mercedes Benz R550 sensor during every pad change.
Does my Mercedes Benz R550 have electronic brake pad wear sensors?
Many vehicles use a mechanical wear indicator instead of electronic sensors. Check your Mercedes Benz R550 owner's manual or use the GeoBrakes vehicle selector to confirm whether your R550 uses an electronic pad monitoring system.
Can a faulty wear sensor keep the brake warning light on my Mercedes Benz R550 on after new pads are installed?
Yes. If the Mercedes Benz R550 wear sensor from a previous brake service was not replaced, or if the probe has been damaged on your R550, the brake warning light will remain on even with new pads. Replacing the R550 sensor will clear the fault and restore normal operation.