Patent ID: 8297715

Claim:
A braking system comprising: a master cylinder interlockingly operated with an operation of a braking operation part; wheel braking means which generates a braking force by a first liquid pressure obtained by operating the master cylinder; a main braking passage connecting the master cylinder and the wheel braking means; a normally-open first solenoid-operated open/close valve provided to the main braking passage for establishing or interrupting communication between the master cylinder and the wheel braking means; a stroke simulator which applies a pseudo reaction force corresponding to a control variable of the braking operation part to the master cylinder; a branch passage branched from the first solenoid-operated open/close valve of the main braking passage and connected to the stroke simulator; a normally-closed second solenoid-operated open/close valve provided to the branch passage for establishing or interrupting communication between the master cylinder and the stroke simulator; a hydraulic modulator which generates a second liquid pressure by an electrically-operated actuator and operates the wheel braking means with the second liquid pressure; a first input-side pressure sensor provided to the main braking passage for detecting a liquid pressure on the master cylinder; and a second input-side pressure sensor provided at a position that has a liquid passage closer to the stroke simulator than to the second solenoid-operated open/close valve of the branch passage for detecting a liquid pressure on the stroke simulator, wherein a measurement resolution of the second input-side pressure sensor is set higher than a measurement resolution of the first input-side pressure sensor.