ANY time you have a fresh rotor surface, you need to bed the pads to the new rotors. Follow these steps to bed in the brake pads:
1. First ensure the brakes are operating correctly by driving for 5-10 miles and using just light brake pedal pressure.
2. Now time for the bed-in process. Make 6 to 10 stops from approximately 35MPH down to 5 MPH by applying moderate pressure. DO NOT DRAG THE BRAKES LIGHTLY.
3. Then do twenty progressively harder stops from 60 mph to 20mph. Your goal is to get them HOT!! You should be able to smell the pads when they get hot enough. DO NOT DRAG THE BRAKES LIGHTLY.
4. Drive 5 minutes in a large circle without hitting the brakes to cool them. You do not want to come to a complete stop until they cool down a fair bit or you will get uneven pad material transfer (which causes the feeling of warped rotors).
5. After cooling them drive home and park the car in gear but WITH HANDBRAKE OFF
4. Let the car sit until rotors are cool to the touch. At least 1 hour but leaving it overnight is even better.
5. Your brakes are now ready to rock and roll!