Brake Caliper: Reassembly
WARNING: This page is about a different car, the 2003 BMW Z8 and 2002 BMW Z8. However, it is still accessible from the selected car via links, so may be relevant.
Coat piston and caliper bore with brake assembly lubricant. Install piston seal. Install dust boot on piston. Using wooden block, install piston and dust boot. Ensure piston is not tilted when installing.