This document discusses different types of mechanical brakes. It describes block or shoe brakes, band brakes, band and block brakes, and internal expanding shoe brakes. Block or shoe brakes use blocks pressed against a rotating drum to stop motion. Band brakes use a flexible steel band wrapped around a drum. Band and block brakes combine blocks fixed inside a steel band. Internal expanding shoe brakes use two pivoted semicircular shoes that expand when force is applied. The document provides detailed diagrams and explanations of how each type of brake works to absorb energy and create frictional resistance to slow or stop moving objects.