Electronic brake system

An electronic brake system, comprising:

• a reservoir configured to store a pressing medium;
• a master cylinder connected to a brake pedal;
• a pedal simulator connected to the master cylinder;
• a hydraulic pressure supply device configured to generate hydraulic pressure by operating a hydraulic piston by an electrical signal output corresponding to a displacement of the brake pedal;
• a hydraulic control unit comprising a first hydraulic circuit and a second hydraulic circuit, and configured to control hydraulic pressure transmitted to the first hydraulic circuit and the second hydraulic circuit, the first hydraulic circuit including a first wheel cylinder and a second wheel cylinder, the second hydraulic circuit including a third wheel cylinder and a fourth wheel cylinder;
• a hydraulic auxiliary device provided in the second hydraulic circuit and configured to supply hydraulic pressure to the third wheel cylinder and the fourth wheel cylinder when the hydraulic pressure supply device is inoperable;
• and
• a pair of actuators provided on a caliper of the first wheel cylinder and the second wheel cylinder, respectively, and configured to perform braking of each of the first wheel cylinder and the second wheel cylinder when the hydraulic pressure supply device is inoperable.