HYDRAULIC PRESSURE ACTUATED PRESSING DEVICE FOR DISC BRAKE

摘要

A hydraulic pressure actuated pressing device for disc brake to compensate the wear of friction pads and to keep the braking clearance constant. A piston of the pressing device has a liquid chamber inside thereof containing a quantity of liquid so that a proper braking cleance is maintained in accordance with the increase of the wear of friction pads while preventing the piston from being retracted even when the hydraulic braking pressure is lost.