Ford 2003 Mustang Workshop Manual page 593

5. Remove the rear disc brake piston and adjuster from the caliper bore.
6. Remove and discard the piston dust boot seal and piston seal from the caliper bore.
7. CAUTION: The parking brake lever pin retainer clip (2A746) and spring cover are
spring-loaded. Use care when removing the parking brake lever pin retainer clip.
Remove the parking brake lever pin retainer clip.
Unload the spring tension from the parking brake lever pin retainer clip and spring cover
using Screw and Cross Block, a 6-mm washer head nut and a 1/2-inch drive 14-mm
socket.
Remove the parking brake lever pin retainer clip with suitable snap-ring pliers.
Remove Screw and Cross Block.