According to ford, you have to remove the E cable before proceeding good luck
Raise and support vehicle.
Remove rear wheels.
Disconnect and plug brake hose from caliper.
Remove parking brake cable retaining clip from brake caliper.
Disconnect parking brake cable.
Using an open-end wrench, hold slider pin and remove slider pin pinch bolt.
Lift caliper assembly away from anchor plate.
Remove slider pins and boots from anchor plate. Remove brake pads and anti-rattle springs