Patent ID: 8701407

Claim:
A hydraulic active booster comprising: an input shaft connected to a brake pedal; a pedal simulator to provide repulsive force against the brake pedal; a control plunger connected to the brake pedal and movable in an axial direction in the pedal simulator; a master cylinder including a first piston, into which the control plunger is inserted, and a second piston moving back and forth according to movement of the first piston to transfer hydraulic pressure to a wheel brake; and an oil supply device for supplying oil to the pedal simulator, wherein the pedal simulator includes a simulator housing having a first receiving part for receiving the control plunger, a second receiving part for receiving a part of the first piston into which the control plunger is inserted, and a third receiving part for receiving a simulator piston, and the third receiving part is separated from the first and second receiving parts.