This document discusses different types of mechanical brakes. It describes block or shoe brakes, which use blocks pressed against a rotating drum to stop motion. Band brakes are also discussed, using a flexible steel band wrapped around a drum. A band and block brake combines these, using blocks fixed inside a flexible steel band. Finally, an internal expanding shoe brake uses two pivoted semicircular shoes that expand inward to engage a drum upon application of force. The document provides diagrams and explanations of how each brake type functions to absorb kinetic energy and produce frictional resistance for stopping or slowing motion.