Hi folks. My Outback (65km) has a rattly, clattering sound from front end, both sides when driving on bumpy surface: Must noticeably when traveling our three mile dirt road to the house. Lightly riding the brakes snubs the noise out. Have replaced the pads, tinkered with the anti-rattle plates, replaced the caliper fixing bolts, stuffed the fixing bolt slide-holes with ht grease. All helps marginally for a few days but the noise returns in full eventually. I can wiggle the caliper enough by hand, to get a muffled click sound from it. Am I on the wrong trail?