How do you reset BMW brake light e46?

If you have replaced the pads and sensors(right front, left rear) put the ignition key to position 1 and wait until the brake warning dummy light goes off. If it stays on you probably have a faulty sensor. Take the old sensor plug it back on and short circuit the two exposed tiny 2-3mm metal pads using a flathead screwdriver or whatever metallic. Turn the ignition key to position 1 and wait until the light goes off. If it does then the replacement sensor is bad, if it doesn't go off, the warning light panel is bad. The sensor is just a closed loop of wire. When the brake pad is worn enough, it scrapes the plastic off the sensor until it erodes the wire causing an open circuit, triggering off the light.