Patent ID: 8025345

Claim:
A vehicle brake system comprising: a booster device for boosting the braking manipulation force exerted on a brake pedal; a master cylinder operatively connected to the booster device; a reservoir tank storing brake fluid for replenishing brake fluid to the master cylinder; wheel brakes provided for respective vehicle wheels and connected to the master cylinder; a hydraulic pressure control device interposed between the master cylinder and the wheel brakes and having a pump for drawing operating fluid on the side of the master cylinder to discharge the operating fluid toward the side of the wheel brakes and a hydraulic pressure control valve capable of restraining the flow of the operating fluid from the side of the wheel brakes toward the side of the master cylinder; a stroke sensor for detecting the moving stroke of the brake pedal; a simulator for applying to the brake pedal a pseudo reaction force corresponding to the moving stroke of the brake pedal; an idling component interposed between the booster device and the hydraulic pressure control device and configured to operate only in a state that communication between the master cylinder and the reservoir tank is blocked, for absorbing the moving stroke of the brake pedal by a predetermined amount; and an electronic control device for controlling the hydraulic pressure control device based on an input from the stroke sensor.