Patent ID: 8430459

Claim:
A hydraulic brake system, comprising: a master cylinder configured to generate a braking hydraulic pressure when a brake pedal operates; a wheel brake disposed on each of front right and left wheels and rear right and left wheels of a vehicle and configured to receive the braking hydraulic pressure from the master cylinder to generate a braking force; a solenoid valve disposed on each of an inlet and an outlet of each of the wheel brakes to control a flow of the braking hydraulic pressure; a low pressure accumulator configured to temporarily store oil, which is ejected from the wheel brakes during an operation of the solenoid valves; a pump configured to compress the oil stored in the low pressure accumulator such that the oil is ejected towards the wheel brakes or the master cylinder; an orifice disposed near an outlet port of the pump; and a damper unit disposed between the outlet port of the pump and the orifice, wherein the damper unit comprises: a damper cylinder through which a first main flow passage of the hydraulic pressure communicates with a second main flow passage of the hydraulic pressure, a piston disposed damper to reciprocate therein, springs disposed at opposite sides of the piston to support the piston, and guides disposed within the damper cylinder and restricting reciprocal displacement of the piston.