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Message: <blockquote data-quote="astroboy" data-source="post: 740775" data-attributes="member: 4527">E90 brake wear detection system works in 2 ways:1. Through the count down of mileage based on a complex algorithm that takes into consideration of the drivers' deceleration patterns. This can be reset. I usually do not reset this when changing brake pads. I will only reset it when it pops up.2. Through the sensor inserted into the pad. Only front left and rear right have them. Once the pad is worn, the rotor will scrub on the sensor and ground the sensor to trigger the alarm on our dash. Parts shop selling these at about RM40 a piece. Rear cost a tad more because the wire is longer.</blockquote>