Patent ID: 7516616

Claim:
A bicycle hydraulic brake actuation device comprising: a hydraulic master cylinder housing having a bore and a push rod guide surface; a master piston and a radial seal received in the bore; a push rod supported by the push rod guide surface for sliding movement within the hydraulic master cylinder housing, the push rod being configured to move the master piston and the radial seal from a neutral position to a braking position; and a lever pivotally attached to the housing for pivotal movement between an at rest position and a brake actuation position, the lever being configured and arranged to move the push rod and the master piston from the neutral position toward the braking position as the lever is pivoted between the at rest position and the brake actuation position, the push rod including a piston contact portion, a lever contact portion and a guided portion, with the lever contact portion being disposed between the contact portion and the guided portion and the guided portion being supported by the push rod guide surface.