Electric brake system

An electric brake system, comprising:

• a hydraulic pressure providing unit that generates a hydraulic pressure of a pressurized medium for braking a vehicle based on an electric signal output in response to a displacement of a brake pedal,
• wherein the hydraulic pressure providing unit includes a reservoir in which the pressurized medium is stored, and which is partitioned into a plurality of reservoir chambers by a partition wall,
• a first hydraulic pressure supply device that generates the hydraulic pressure by operating a hydraulic piston by the electric signal output in response to the displacement of the brake pedal,
• a hydraulic control device that controls a flow of the pressurized medium provided from the first hydraulic pressure supply device or recovered to the first hydraulic pressure supply device,
• a hydraulic circuit that regulates the hydraulic pressure of the pressurized medium applied to a plurality of wheel cylinders, and
• a second hydraulic pressure supply device that generates the hydraulic pressure by operating a hydraulic pump by the electric signal output in response to the displacement of the brake pedal, and
• a discharge passage connecting the plurality of wheel cylinders and the reservoir so that the pressurized medium of the plurality of wheel cylinders is discharged into the reservoir,
• the second hydraulic pressure supply device is provided between the hydraulic control device and the hydraulic circuit,
• wherein the hydraulic circuit includes a first hydraulic circuit that controls the flow of the pressurized medium supplied to a first wheel cylinder and a second wheel cylinder, and a second hydraulic circuit that controls the flow of the pressurized medium supplied to a third wheel cylinder and a fourth wheel cylinder, and
• the second hydraulic pressure supply device includes at least one hydraulic pump that provides the hydraulic pressure of the pressurized medium to the first hydraulic circuit and the second hydraulic circuit, and
• a reservoir passage that connects the reservoir and a suction side of the hydraulic pump,
• wherein the reservoir passage is connected to one of the reservoir chambers, and
• the discharge passage is connected to another one of the reservoir chambers.