MASTER CYLINDER AND ELECTRONIC BRAKE SYSTEM INCLUDING THE SAME

A master cylinder and an electronic brake system including the same are disclosed. The master cylinder includes a cylinder body connected to a reservoir and provided with a bore, one end of which is opened in a longitudinal direction, a piston configured to be movable forward and backward within the bore, and at least one master chamber configured to discharge a master chamber in response to a displacement of the piston. The master cylinder includes a pedal simulator provided in the bore. The pedal simulator is spaced apart from the piston by a predetermined distance, is directly pressurized by a brake pedal, and thus provides reaction force. The simulation chamber is formed in the bore, and is separated from the master chamber by the pedal simulator. The simulation passage connects the simulation chamber to the master chamber. The simulation valve is provided in the simulation passage, and controls flow of a pressing medium in response to an opening/closing operation thereof.