Patent ID: 8714322

Claim:
A hydraulic brake mechanism mountable to a handlebar, the brake mechanism comprising: a housing mountable to the handlebar; and a master cylinder assembly disposed within the housing, the master cylinder assembly including; a fluid chamber, comprising: a first chamber portion having a first diameter, a second chamber portion having a second diameter, the first diameter greater than the second diameter, and a transition region between the first and second chamber portions; a piston assembly, comprising: a piston slidably disposed within the fluid chamber, a first seal configured to sealingly engage between the first chamber portion and the piston, and a second seal configured to sealingly engage between the second chamber portion and the piston; an outlet port extending from the fluid chamber from at least one of the transition region, the first chamber portion and a proximate portion of the second chamber portion; and an actuator operatively connected to the housing and configured to slidably displace the piston assembly in the fluid chamber.