Patent ID: 7757821

Claim:
A bicycle hydraulic brake actuation device comprising: a hydraulic master cylinder housing having a bore; a master piston movably mounted in the bore; a push rod operatively coupled to the master piston for reciprocative movement of the master piston in the hydraulic master cylinder between a neutral position and a braking position; a lever pivotally attached to the housing for pivotal movement between an at rest position and a brake actuation position, the lever including at least one first elongated slot; and a reach adjustment mechanism having an elongated pin and a cam member with at least one second elongated slot, the first and second elongated slots being approximately perpendicular to one another with the lever in the at rest position, the elongated pin extending through both the first and second elongated slots coupling the cam member to the lever for movement therewith, the reach adjustment mechanism being coupled to the lever for movement therewith to operatively engage the push rod and adjust the at rest position of the lever relative to the housing, the reach adjustment mechanism being arranged such that a first lever ratio remains constant regardless of adjustments to the at rest position of the lever, the first lever ratio being defined as a linear movement distance of the master piston relative to an angular movement distance of the lever with the lever proximate at the rest position and the piston proximate the neutral position.