Your rear caliper on 1998 Taurus won't compress are you missing something or is the caliper messed up?
On 1998 Tuarus' You must roate the plunger with either a needle
nose pliers or the specilty tool that ford makes, i use a channel
lock pliers being very careful not taer the boot or go the wrong
way and remove the plunger. I belive it is for most of this model
run of tuarus' that you do this it is a really bad design.