Patent ID: 8157334

Claim:
A brake system, comprising: a regenerative braking hydraulic pressure line that connects a master cylinder with a wheel cylinder; a regenerative control valve disposed in the regenerative braking hydraulic pressure line for opening the regenerative braking hydraulic pressure line when supplied with power and for closing the regenerative braking hydraulic pressure line when not supplied with power; a proportional control valve disposed in the regenerative braking hydraulic pressure line to supply the hydraulic pressure supplied from the master cylinder through the regenerative control valve to the wheel cylinder during regenerative braking, wherein the proportional control valve comprises a spool, and wherein output characteristics of the proportional control valve vary in response to an amount of pressure applied to the spool; and a spool operator that changes the amount of pressure applied to the spool; wherein the regenerative control valve is disposed closer to the master cylinder, and farther from the wheel cylinder, than the proportional control valve.