Here's how it works:
The brake sensor is basically a wire molded into a plastic piece. When the brakes wear to a minimum, they rub through the wire. The DSC control module see's the wire has been broken and triggers the light. Be sure to replace the sensor when you change the brakes. Then to reset the light is this expansively complex procedure of turning your key on and letting it sit with key on, engine off for about 50 seconds. Thats it!