| 摘要 |
<p>PURPOSE:To provide a hydraulic brake pressure control system, with which reduction of performance is prevented by providing for communicatin to the side of a pressure reduction chamber of an actuator with more provision of a control valve means in another system. CONSTITUTION:When defectiveness of the wheel rpm takes place during the brake action and is sensed by a wheel sensor, a directional control valve 300 is switched by the action of a computor to change vacuum in a chamber 40 into atmospheric pressure. As a result, a power piston 39 is moved rightwards due to a pressure difference between chambers 40 and 41 to operate a control valve 33 through a rod 43, thus blocking a first port 36 in communication with a master cylinder 10 and a second port 37 in communication with a wheel cylinder 13 and communicating the second port 37 with a third port 33 in communication with a cylinder section 25d of an actuator 100. As a result, a left rear brake cylinder 13 is disconnected from a master cylinder 10.</p> |
