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$8.19
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SEN-2BWS0007• Front• Disc Brake Pad Wear Sensor
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GeoBrakes stocks OEM-grade disc brake pad wear sensors confirmed to fit the Mercedes Benz A45, the single-use probe components that trigger your A45 dashboard warning light the moment your brake pads approach minimum thickness. Every sensor is direct-fit for the Mercedes Benz A45
Standard/OE$8.19
10 items in stock
Select your vehicle to see compatible products and accurate pricing
A disc brake pad wear sensor on the Mercedes Benz A45 is your vehicle's advance warning system for brake pad replacement. It eliminates the need to rely on audible squealing from your A45 to know your pads are getting thin, instead triggering a dashboard warning light at a preset minimum thickness on the Mercedes Benz A45, giving you time to plan the replacement before the pads wear through to the metal backing plate. Replacing a triggered sensor with every A45 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 A45 is a small probe embedded in or clipped to the brake pad. When the A45 pad wears down to the replacement threshold, the probe contacts the rotor surface. This contact creates a circuit change that signals the Mercedes Benz A45 ABS or brake control module, illuminating the brake warning light. Once the probe on the Mercedes Benz A45 has contacted the rotor, it is destroyed and cannot be reused. It is a single-use component by design on the A45.
Installing fresh brake pads on the Mercedes Benz A45 without fitting a new wear sensor defeats the entire purpose of having a brake monitoring system on your A45. A previously triggered sensor probe is worn through and has no remaining material to detect the next set of A45 pads wearing down. From day one of the new Mercedes Benz A45 brake pads, the warning system is non-functional without a new sensor.
Wear sensor compatibility for the Mercedes Benz A45 is more exacting than most brake parts. The probe length, contact resistance specification, and connector design must all match the A45 brake monitoring circuit precisely. A wrong sensor triggers Mercedes Benz A45 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 A45, 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 A45?
Yes, on Mercedes Benz A45 vehicles equipped with electronic wear sensors. The sensor probe on your A45 is a single-use component. Once it has contacted the rotor and triggered the A45 warning light, the probe is consumed. Always replace the Mercedes Benz A45 sensor during every pad change.
Does my Mercedes Benz A45 have electronic brake pad wear sensors?
Many vehicles use a mechanical wear indicator instead of electronic sensors. Check your Mercedes Benz A45 owner's manual or use the GeoBrakes vehicle selector to confirm whether your A45 uses an electronic pad monitoring system.
Can a faulty wear sensor keep the brake warning light on my Mercedes Benz A45 on after new pads are installed?
Yes. If the Mercedes Benz A45 wear sensor from a previous brake service was not replaced, or if the probe has been damaged on your A45, the brake warning light will remain on even with new pads. Replacing the A45 sensor will clear the fault and restore normal operation.