Strange rear brake hardware
2010 XLT 4.0 stickshift. Took apart the back brakes at work the other day and found these odd-looking pieces attached to the upper caliper bolts on both sides. No idea what they could be. Sensors? Balances? Explosives? Alldata diagrams of the back brake system do not show the part. It has no power source and no obvious connection or function. Any clues?