yes my mistake I read the how to to change rear brake pads and it says remove rubber grommet and inside is a allen key bolt there was no bolt only a long lug that is in the picture so the caliper was moving about .the only bolts on the caliper that were holding it in place was the 2 sliders that hold the pads in place
so the calipers was moving around on these to long lugs
now I thought the caliper should of been bolted up to stop movment
so I need a new lug