The electric brake system for vehicles includes a pressure supplier connected to a reservoir through a hydraulic passage to receive the oil, the pressure supplier outputting a brake will of a driver as an electric signal through the pedal displacement sensor, when the driver pushes the brake pedal, to operate a motor and convert a rotational force of the motor into linear motion, a hydraulic control unit including a first circuit including at least one first vehicle wheel and a second circuit including at least one second vehicle wheel to receive a hydraulic pressure with a force generated by the pressure supplier and thereby perform braking, a blocking valve to control the hydraulic pressure from the master cylinder to a wheel cylinder disposed in each vehicle wheel, a simulation device connected to the master cylinder, to provide a reaction force response to the pedal effort of the brake pedal, and an electronic control unit to control the motor and the valves, based on pressure information and pedal displacement information.