Replaced the entire set of pads all around when I discovered two weeks after buying the car that the drivers side rear was dragging the interior shoe into the rotor (now groovy). Figured that would solve it for at least a month while I shopped replacement parts such as rotors and test kits for brake pressure at the wheel cylinders, and ceramic (OE) pads vs the semi metallics I put on it for the time being. Now, less than three calendar weeks later I have been dragging the same pad shoe for four days now... seems to be a malfunctioning caliper, but am curious if there could be more issues behind the caliper such as wheel cylinders or master problems... any suggestions or tips welcomed.. DS