Patent ID: 8789668

Claim:
Master cylinder assembly for balancing the braking between at least a couple of wheels of a vehicle, comprising: a plurality of master cylinders, each having a hollow body, a primary piston mounted slidable into said hollow body following a working direction, and a primary chamber defined by said primary piston in said hollow body and suitable for containing a fluid having a primary control pressure depending on a driving force applied on said primary piston movable into said hollow body; said primary control pressure configured to be transmitted to at least one primary user device connectable to said primary chamber; a primary balancing duct into which comes out at least a couple of said primary chambers configured to transmit the respective primary control pressures to at least a couple of coordinated primary user devices; and a plurality of respective primary balancing valves which are normally closed, each of them being located between said primary balancing duct and a respective primary chamber; wherein at least one of said primary balancing valves has a primary shutter mechanically unconstrained to the primary piston defining the primary chamber to which said at least one primary balancing valve is associated; said primary shutter being operable so as to open in a fluid-controlled manner by the primary control pressure assumed by the fluid contained in the primary chamber to which said at least one primary balancing valve is associated, wherein said primary shutter is slidable in a respective housing integral with the master cylinder hollow body and parallel to said chamber, and is movable in a sliding direction which is parallel and opposite to the working direction of the primary piston against the action of elastic return means, and wherein said primary balancing valve has a respective hole radially provided through the housing with respect to said sliding direction, coming out into said primary balancing duct, and suitable for being obstructed by said primary shutter.