I can see much confusion on the brake change procedure and it took me awhile. The brakes are very simple to replace. Don't fear it, get your pads (rear for $35.00), check your rotors and YES change the wear sensor (rear $9.00) or you will run into the red car on lift, red brake light and the _ _ _ _ in the mileage display. Once you do this follow the odometer/BC reset process and you'll be good to go. I tried to get by without changing the sensor to save time... well that was a mistake and they are very easy to change! Good luck and don't be afraid because it's a BMW.
2007 BMW 335i