Patent ID: 7861523

Claim:
A vehicular brake system comprising: (a) an input piston that is supported in a cylinder to be movable in an axial direction of the cylinder, (b) an operating device coupled to the input piston, (c) a pressure piston that is disposed coaxially with the input piston and is supported in the cylinder to be movable in the axial direction, (d) control oil pressure setting means for setting a control oil pressure in accordance with an amount of operation of the operating device which is received by the input piston, (e) oil pressure supplying means for applying the control oil pressure set by the control oil pressure setting means to the pressure piston so as to generate a braking oil pressure being directly applied to a wheel cylinder, and (f) operating force absorbing means for absorbing operating force applied from the operating device to the input piston, wherein the pressure piston is supported in the cylinder to be movable in the axial direction such that the pressure piston can be pressed directly by the input piston, wherein the oil pressure supplying means applies the control oil pressure set by the control oil pressure setting means to a first pressure chamber located on one side of the input piston as viewed in the direction of movement of the input piston or a second pressure chamber located on the other side of the input piston so as to generate the braking oil pressure, and wherein the operating force absorbing means includes a communication passage that allows a hydraulic oil to flow between the first pressure chamber and the second pressure chamber so as to absorb operating force applied from the operating device when the input piston moves in response to the operating force.