Reply to thread

Message: <blockquote data-quote="astroboy" data-source="post: 376874" data-attributes="member: 4527"><img src="http://www.roverparts.com/product/img/Icn/SOE000011.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />This is a very simple device.. single wire, the tip is some exposed wires but enclosed in a glass capsule. When pad too thin, the glass capsule will rub on the brake disc and cause it to break, allowing the expose wire to touch the rotor and ground the electrical signal carried by the wire. This will complete the circuit resulting in the illumination of the dash warning bulb. No computer needed back in the E36 era. Simple elementary school science topic on electric circuit.Every wheel with disc brake, there's 2 pads (in/out) to clamp on the brake disc. They might not wear evenly and only the inner pad has the pad wear sensor for one of the front wheel, one for the rear wheel, total 2 sensors. So if you see thinning on the outer pad doesn't mean the inner pad is thin as well, thus warning may not necessary be triggered. So if you can see balance 3mm on the outer pad, don't need to wait anymore, just replace them and salvage your pad wear sensor.Yes, pad wear sensor can be salvaged if the glass capsule remain intact. Most foreman will persuade u to replace as well which I think is a rip off! *&^%$#@!!</blockquote>