Ford 2003 Mustang Workshop Manual page 447

Disconnect the parking brake cable and conduit from the parking brake lever and the caliper.
For additional information, refer to
8. Separate the parking brake cable and conduit from the knuckle.
9. Remove the rear brake disc. For additional information, refer to
Remove the rear brake caliper and support bracket from the knuckle as an assembly.
Wire the caliper and support bracket assembly out of the way.
10. Remove the rear brake anti-lock sensor and position it aside.
11. Support the lower suspension arm and bushing with a jack stand.
12. Remove and discard the nut and bolt.
13. Remove and discard the cotter pin and nut.
Section 206-05 .
Section 206-04 .