WARNING: This page is about a different car, the 2003 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
Using the special tool, compress the brake caliper piston and adjuster into the disc brake caliper. Align the piston notch in the up and down position.
Fig 1: Compressing Brake Caliper Piston And Adjuster Into Disc Brake Caliper