Patent ID: 7530646

Claim:
A master cylinder assembly for hydraulic control comprising: a master cylinder body having a longitudinal bore; a piston arranged in said bore, said piston comprising a seal packing in tight contact with a peripheral wall of said bore and separating said bore into two chambers adapted to contain a liquid, said piston further comprising a recovery conduit and a valve, said recovery conduit connecting said two chambers, said valve being movable between a open position, thereby opening said recovery conduit to allow fluid flow therethrough, and a closed position, thereby closing said recovery conduit to fluid flow, said valve being biased to said closed position, said piston having a rest position within said bore; a pin arranged in said bore and adapted to co-operate with said valve when said piston is in said rest position, said pin having a cam surface moveable between a first state corresponding to said open position and a second state corresponding to said closed position; a crank connected to said pin; a rod rotateably connected to said crank; and an electrical actuator arranged outside of said master cylinder body, said actuator being operably coupled to said rod to adjust a position of said pin between said first state and said second state when said piston is in said rest position.