A hydraulic brake system comprising: a hydraulic pressure source provided for a vehicle, and including a hydraulic-pressure generating device and a reservoir; a plurality of hydraulic brakes (40, 50) provided for respective wheels (2, 4, 46, 48) of the vehicle, and configured to restrain rotations of the respective wheels when being activated by hydraulic pressure of said hydraulic-pressure generating device; and a plurality of control valve devices (220FL, 220FR, 220RL, 220RR) which include (a) an ON/OFF control valve (211, 213) and (b) a linear control valve (210, 212) that are disposed in parallel with each other, wherein said ON/OFF control valve (211, 213) is opened and closed by an ON/OFF control that is applied to supply of an electric current to a solenoid of said each of said ON/OFF control valve (211, 213), wherein said linear control valve (210, 212) is capable of continuously controlling a pressure difference between a high-pressure side and a low-pressure side of said linear control valve (210, 212), by a continuous control that is applied to supply of an electric current to a solenoid of said linear control valve (210, 212), characterized in that said plurality of control valve devices (220FL, 220FR, 220RL, 220RR) includes a plurality of first hydraulic-pressure control valve groups (212, 213), each of said first hydraulic-pressure control valve groups (212, 213) being disposed between a corresponding one of brake cylinders (42, 52) of said hydraulic brakes (40, 50) and said reservoir; and said hydraulic brake system includes an individual hydraulic-pressure controlling portion configured to determine target values of hydraulic pressures in the respective brake cylinders (42, 52) individually from each other, and to decrease the hydraulic pressures in said respective brake cylinders (42, 52) individually from each other by controlling said plurality of first hydraulic-pressure control valve groups (212, 213) individually from each other. a hydraulic pressure source provided for a vehicle, and including a hydraulic-pressure generating device and a reservoir; a plurality of hydraulic brakes (40, 50) provided for respective wheels (2, 4, 46, 48) of the vehicle, and configured to restrain rotations of the respective wheels when being activated by hydraulic pressure of said hydraulic-pressure generating device; and a plurality of control valve devices (220FL, 220FR, 220RL, 220RR) which include (a) an ON/OFF control valve (211, 213) and (b) a linear control valve (210, 212) that are disposed in parallel with each other, wherein said ON/OFF control valve (211, 213) is opened and closed by an ON/OFF control that is applied to supply of an electric current to a solenoid of said each of said ON/OFF control valve (211, 213), wherein said linear control valve (210, 212) is capable of continuously controlling a pressure difference between a high-pressure side and a low-pressure side of said linear control valve (210, 212), by a continuous control that is applied to supply of an electric current to a solenoid of said linear control valve (210, 212), characterized in that said plurality of control valve devices (220FL, 220FR, 220RL, 220RR) includes a plurality of first hydraulic-pressure control valve groups (212, 213), each of said first hydraulic-pressure control valve groups (212, 213) being disposed between a corresponding one of brake cylinders (42, 52) of said hydraulic brakes (40, 50) and said reservoir; and said hydraulic brake system includes an individual hydraulic-pressure controlling portion configured to determine target values of hydraulic pressures in the respective brake cylinders (42, 52) individually from each other, and to decrease the hydraulic pressures in said respective brake cylinders (42, 52) individually from each other by controlling said plurality of first hydraulic-pressure control valve groups (212, 213) individually from each other.