This sensor basically monitors the wear on your brake pads. It doesn’t measure how much pad is left directly, but it detects the position of a little wear indicator that’s built into the pad itself. When your pads get thin enough, that indicator comes into contact with the sensor and completes a circuit, triggering a warning light on your dashboard. Sometimes it's just a light, and other times the car’s computer might display a specific message. It's a critical part of your braking system, obviously. It doesn’t make the brakes work, but it lets you know when the parts that do—the pads—are getting dangerously low. Think of it as an early warning system. It’s usually located near the brake caliper, so it’s constantly checking the pad thickness as you drive. It's a pretty simple part, mechanically, but hugely important. Well, running your brakes down to nothing isn’t an option, right? If you ignore the warning light from this sensor, you risk damaging other expensive parts like the rotors. Those are the discs the pads squeeze against. Replacing rotors is a lot more expensive than replacing pads. You’ll notice if the sensor fails because the warning light will either stay on constantly even with good pads, or won’t come on at all when your pads are worn. It’s one of those things that’s easy to take for granted until it’s not working. You can find these sensors readily available, we stock a lot of them at Fixparts Online, and replacing it is usually pretty straightforward, although sometimes the connector can be a bit fiddly. Built to endure: Sensor (MPN 34356759918) comes with a 12-month warranty!

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