Fail-safe disc brake having a slack adjuster mechanism

摘要

A fail-safe actuator for a disc brake system. A housing contains a reciprocating piston having a retracted position, a spring which urges the piston forward away from its retracted position, and means for retracting the piston against the urging of the spring. An expansible linkage, which connects the piston to the friction element of the brake is expanded in response to retraction of the piston, thereby maintaining a uniform spring expansion per brake application regardless of friction element wear.