Cleaning & Inspection
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 BMW M5, 2003 BMW 540i, 2003 BMW 530i, 2003 BMW 525i, and 2002 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.
Clean components in alcohol and dry with compressed air. Inspect caliper bore and pistons for wear or damage. Replace caliper assembly if cylinder bore is corroded or worn. DO NOT hone.