Abstract: An improved rotor for a disk brake is disclosed having a multi-piece construction. The rotor has a central web extending around a driving drum portion such that the web defines several generally radially extending cooling passages. The central web is mounted on the driving drum portion so as to be capable of sliding laterally, but may not rotate relative to the driving drum. Friction elements, completely separate from the central web, are located on either side of the central web and are mounted on the driving drum so as to be also capable of lateral movement. The friction elements are also prevented from rotating relative to the driving drum portion of the rotor.