Originally Posted by toastedoats
that is caused be the caliper not sliding freely on the pins and the brackets, the caliper wants to retract, however over time the metal pitts and the grease washes off and causes the caliper to not return to the original position nearly as easily
That was my initial thought but when I looked at the pins, there wasn't any corrosion and they were still well lubricated so I figured I better look a little further. In looking at the pad, there was absolutely not a trace of friction material left and then I found a decent sized chunk of pad wedged between the caliper and the rotor. Putting 2 and 2 together, it was pretty obvious that the entire friction material had become unbonded to the backing plate.
"did the symptoms come on suddenly or gradually?" For the week or so before, it felt like there was some additional pedal travel that I wasn't used to but the major problem came all of a sudden about a block from my mother-in-law'* house. Since I didn't want to be stuck there any longer than I had to be, that'* why I decided to limp the 300 miles home.