Patent ID: 8091356

Claim:
A vehicular brake system comprising: an input piston that is supported in a cylinder to be movable in an axial direction of the cylinder; an operating device coupled to the input piston; a pressure piston that is disposed coaxially with the input piston and is supported in the cylinder to be movable in the axial direction; 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; 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 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 one of the input piston and the pressure piston is at least partially received in the other and such that the pressure piston can be pressed by the input piston, and the operating force absorbing means comprises a discharge passage that allows a hydraulic oil to be discharged from a pressure chamber located between the input piston and the pressure piston so as to absorb operating force applied from the operating device when the input piston moves in response to the operating force.