Well, at least you identified the problem, and it's pretty straightforward. A lot of times, you can chase sub-par braking performance for a while before finding the culprit.
One new caliper, bleed the whole system, and you should be good to go.
97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles