2003 Ford Escort caliper piston

To get piston back into housing. Insert old brake pad or small block of wood into caliper in front of piston. Use a pair of large pipe grips to force piston back into housing. It should go easy. If not then it may be jammed up. And you need to free it off?

FRONT BRAKE CALIPER & PADS
Removal
Raise and support vehicle. Remove front wheels. Remove 2 brake pad pins and springs. See Fig. 6, Fig. 7 and Fig. 8. Remove brake pads and shims. See Fig. 9. Disconnect brake hose connector bolt from caliper, and discard copper washers. Mark caliper as right or left for installation reference. Remove caliper bolts. Remove brake caliper.
Installation
Compress piston until it is fully seated into caliper bore. Install caliper and tighten mounting bolts to specification. See TORQUE SPECIFICATIONS. Using 2 NEW copper washers, install brake hose. Apply a light coat of high-temperature grease between anti-rattle shims. Install brake pads and shims. Install springs and brake pad pins. To complete installation, reverse removal procedure. Refill and bleed system. See BLEEDING BRAKE SYSTEM