HYBRID BRAKE SYSTEM

1 . A hybrid brake system comprising:

an input shaft connected to a brake pedal;

a pedal simulator provided therein with a control plunger connected with the input shaft;

a master cylinder communicating with the pedal simulator and provided therein with first and second pistons;

an oil supply part supplying oil to the pedal simulator and the master cylinder; and

a boosting part communicating with the pedal simulator and generating repulsive force when the brake pedal is pressed.

2 . The hybrid brake system of claim 1 , wherein the pedal simulator includes a simulator housing having a chamber for receiving the control plunger, and the boosting part is provided at a lower portion of the simulator housing and has a parallel structure.

3 . The hybrid brake system of claim 1 , wherein the boosting part includes a cylinder communicating the pedal cylinder, a spring retainer, which slides upward or downward in the cylinder, a compression spring compressed by the spring retainer, and a housing cap supporting the compression spring.

4 . The hybrid brake system of claim 2 , wherein the simulator housing is provided therein a first oil port for supporting oil into the cylinder.

5 . The hybrid brake system of claim 1 , wherein the master cylinder includes a second oil port for supplying oil to a space between the second piston and an internal surface of the master cylinder.

6 . The hybrid brake system of claim 5 , wherein the second piston is a booster piston to move the first piston while moving forward by oil received therein through the second oil port.

7 . The hybrid brake system of claim 1 , wherein the first piston has a recess part recessed inward from a rear end of the first piston, a front end portion of the control plunger is inserted into the recess part, and a gap is formed between the recess part and the control plunger.