Caliper disc brake assembly.

摘要

A disc brake unit (10) for machinery, hoists and the like having a pair of brake shoes (20) normally spring biased to a brake engaged condition. A hydraulically operated first piston (27) may be hydraulically actuated to relieve the spring bias to release the spring pressure acting on the disc (13) and thus release the brake. A second piston (30) may then be actuated for moving the brake shoes (20) against the disc (13) and applying a modulated force to said disc (13) while the first piston (27) is in position to oppose the spring bias, to thereby apply slip braking torque to the output shaft.