Could be a one time weather related fluke. I had a P brake cable freeze up (not on a Taurus, but another rear drum Ford) on one wheel years ago after a winter rain storm followed by a rapid 40 deg temp drop = everything was ice. I just took another car and let that one sit a few days. Worked fine after a thaw, and never gave problems after that one time for the 2 or 3 years until I junked that car.