If you get brake shudder and also if you run your finger on the disks and its bumby there signs. Whether or not there at the point of no machining the brake place can tell you unless its really obvious that there gone your can safely say so. Yeah those disks in the link are fine, if your in melbourne try better brakes in mitcham great guy if you ever need exedy clutches or any brakes he will beat any price you give him.