wagon530xi

I had dealer replace my front brake pads and rotors almost 2 years ago at 50k miles. The replaced brake has been making very loud screeching sound when I apply brake. I had the dealer to check it again soon after it was replaced and nothing was wrong or could be adjusted. I was told that with time the screeching noise will go away. But it has been two years? My original front brake was very quiet. It is kind of annoying. Is it anything wrong with it? can it be adjusted?