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Re: brake pads lights
Make sure the brake discs are still within spec, as they usually only last the life of one set of OE pads.
Make sure your brake pads has the recess to accept the clip in wear sensor on the inner Right rear brake pad, and front drivers inside pad.
If you have refitted these, and it is defective, you may need to replace it.You can disconnect the lead and check you have continuity. - You should have on a good sensor.
When the pads wear past 2mm, the discs slice through a small plastic bump - and break a wire link - thus the light comes on the dash.
After replacement of wear sensor, leave key in 'on' position for a couple minutes and the light will go out.
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Study light? Do you mean warning light?
There are sensors clipped into the brake pads on the front left and rear right wheels. When the brake pads get very thin, those sensors rub on the brake rotors, and the light illuminates in the dash indicating that it is time to replace the brake pads.
The light can also illuminate if something damages the wire to the sensor. I usually replace my pads before they get down to the sensors, so I re-use my old sensors. Although the wires are fairly well secured to the suspension, after a few years, the wires can get chaffed from the wind blowing them around, and the damaged wire can turn on the warning light.
As the brake pads wear, the brake pad wear sensor contained in the brake pad contacts the brake rotor. This causes the sensor to fail. When a pad wear sensor fails it opens the ground circuit of the pad wear warning light system causing the pad wear warning light to illuminate. Perform normal brake service to correct this condition and be sure to replace the brake pads with pads containing wear sensors. Once the brake pads and wear sensors are replaced, reset the brake pad warning system by turning the ignition switch to the "on" position. As long as continuity to ground exists through all the brake pad wear sensors the system should reset and the pad warning light in the dash will go out. If the pad warning light does not go out, a check of the pad warning circuit for an open circuit condition or poor ground must be performed.
I dunno if this will work on your BMW, but on my BMW Z3 and M3, it was....
Turn the ignition key to position 2, but do NOT start the car. Wait for
about 45 seconds and the brake warning message will be reset.
If it doesn't reset, then the brake sensor was damage. You will need to replace the brake sensor. It sounds like you replace the brake right after you saw the warning, so the brake sensor should be okay.
This light should turn off if you replace the pads with pads that have the indicator wire on them. The light truns on when you wear the pads down to the wires and the wires break and cause an open circuit that turns on the light. If your new pads have the wires and are installed correctly, the light should turn off by itself.