there was a TSB out on this.
the squeak has to do with the ebrake cable.
something about the star shaped bracket that needs to be repositioned.
cobrar had this same annoying squeak and he tried everything until he came upon the TSB.
He brought it to our ford dealer and they fixed it for him. no more squeak.
Just did a quick search and came up with this:
http://www.contour.org/FAQ/FAQ.cgi?s=probs&display=creak
it lists TSB #11288.
