34356773017 BMW BRAKE SENSOR

This little guy’s job is pretty simple—it monitors the thickness of your brake pads. It doesn’t actually stop anything, it just tells you when your pads are getting thin. It does that with a wire that completes an electrical circuit when the pad material is above a certain level. As the pad wears down, eventually it hits a point where the wire is exposed, breaking the circuit and triggering a warning light on your dashboard. Some systems will even give you an audible chime. It’s part of your overall braking system, naturally, but it's more of a notification system than a direct braking component. Think of it like a guardian—it doesn’t stop the car, but it alerts you to a problem before it becomes a bigger, more expensive one. It prevents you from wearing your rotors down to nothing by continuing to drive on completely gone pads. It really acts like a shield for those more expensive pieces. Ignoring a worn brake pad sensor light is a really bad idea. Running your brake pads down to the metal backing doesn't just kill your stopping power, it’ll seriously damage your rotors. Rotors are much more expensive to replace than pads, so this sensor is saving you money in the long run. You’ll notice if it’s going bad because the light will come on even after you’ve replaced your pads, or it might just be intermittent. You can find these pretty easily—Fixparts Online carries them, for example—and they’re generally a straightforward DIY job, or your mechanic can swap it out quickly during a brake service. Top-rated performance: Brake Pad Wear Sensor (MPN 34356773017) has a 12-month warranty!

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