I just torn my back end off and it is the screws that hold my brake disc, shoes, and pads. The bottom screw was tighten up by itself. Looks like I need to use some thread lock there lol. I was in a hurry with putting it back to together after I made the brake seat and disc upgrade. I have been out of commisisson for a month now and wanted to get back on the road in a hurry. Sorry for the bother it was my foolishness