Abstract: Caliper brake assembly using a cam structure to actuate brake shoes to permit selection of a wide range of braking forces and to increase design flexiblity. The assembly has a frame journalling a pair of opposed arms with opposed brake shoes hinged adjacent opposed inner ends of the arms to brake a disc sandwiched between the shoes. The cam structure includes a cam member having a cam surface which cooperates with a brake actuator so that the cam surface is displaced by the actuator. A pair of cam followers cooperate with the respective arms and the cam surface during brake actuation to rotate each arm about a respective hinge axis relative to the frame so as to force the shoes against the disc. In one embodiment the cam member is displaced parallel to the hinge axes and each cam follower includes a swivellably mounted roller to accommodate swinging of the arms. In an alternative embodiment, the cam has double-acting wedges in which the actuator effectively floats between the arms.