My brake pad wear warning light on the dashboard is constantly on and has been like this since we had the brake pads renewed some months back, the pads were not genuine BMW items. Our local garage has checked for faulty sensors but cannot even find any wiring for sensors or pads.
There should be sensors, not able to find them means they are not there, hence the light is on. You can buy the sensors from your dealer. +/- $8. When they have been lid, you have to replace them. I think the mechanic who changed the pads, removed the sensorcable.
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if you didn't replace the brake pad wear sensor, you wont be able to reset the light. if you did and it still doesn't reset, you need to get into the maintenance system with a scanner, (your local garage should be able to do it) and reset the brake pad wear counter
That is the brake pad warning light. When is goes off the brakes, front or rear, need to be replaced. The brake pads and the sensor have to be replaced, as once the sensor is tripped, it can't be reset.
Did they replace the brake pad wear sensor? If so, try leaving the key in the on postion for 30-45 seconds (dont start the car) This is how we reset the lights on BMW's and the Mini's use a similar system for service lights
it may be time for new brake pads, and you usually want to replace your rotors when you change pads, you can get away with not doing and instead take it to a shop and get them "turned"
if you want to see for yourself if it's time for new brake pads just remove one of your wheels and look at your brake pads (they are the what actually make contact with your rotor) and if the pad itself is less than the width of about 2 or three credit cards, then it's time for new pads.