ok, so i left school today and my brakes were squeking, so i took wheel off, pads are worn out, so i go to parts store and get some and attempt to put them on......took bottom bolt out of caliper(the slide pins that hold it to the bracket) then comes the top bolt, it doesnt have a head on it or a plug or anything in it, i know it has to come off, its froze up so i cant slide caliper to put new pads on, any help on how to get caliper off? also would it be smart to just replace caliper and hardware or to just grease everything and clean up hardware? Thanks