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Did you clean the new disc with brake clean ? , otherwise get a micrometer and measure around its diameter and see if the thickness is the same if it's not , maybe return it this causes pulsing ..A small amount of measured run out measured with a dial indicator, of disc is ok for pad knock back , maybe a couple of thou , this wont cause pulsing .To run in pads and disc , do approx 10 60mph down to a slow speed, not a dead stop as you can warp the disc , this general info .cheers

[QUOTE="Shelby-Right, post: 628307, member: 13898"] Did you clean the new disc with brake clean ? , otherwise get a micrometer and measure around its diameter and see if the thickness is the same if it's not , maybe return it this causes pulsing ..A small amount of measured run out measured with a dial indicator, of disc is ok for pad knock back , maybe a couple of thou , this wont cause pulsing .To run in pads and disc , do approx 10 60mph down to a slow speed, not a dead stop as you can warp the disc , this general info .cheers [/QUOTE]