I just got my 2nd year service done. I brought the car in for inspection, 2nd year service, and vibration when braking. They called me back and said the front rotors needs to be replaced and rear brake pads are at 2mm. I was not happy since I only have 21,500 miles. My X5 was able to go 37K miles before replacing the pads.
The SA said that they will replace the front rotors for free if I agree to replacing the rear brake pads. The front rotors should be replaced for free under warranty because of the vibration when braking. If I didn't do the rear pads, they wouldn't replace my front rotors? Not sure why he said that. It was unexpected.
I did do a search here and noticed that it's common for the rear brake pads to be replaced early due to the size of the rear brakes and the size of the car. This is the first time I had to have brake pads replaced this early.