| 摘要 |
PURPOSE:To prevent kickback of brake pedal without requiring a high pressure accumulator by leading working liquid delivered from a pump through an inlet valve to a liquid path communicated with a wheel brake. CONSTITUTION:When anti-lock control is started, an inlet valve 4 and an outlet valve 5 are supplied with power and the inlet valve 4 interrupt liquid flow while the outlet valve 5 allows liquid flow. When the outlet valve 5 is interrupted with power, boost mode is achieved while when the outlet valve 5 is supplied with power, pressure drop mode is achieved. When time distribution between boost mode and pressure drop mode is selected properly, slow repressurization for a wheel brake 3 can be realized. Since working liquid delivered from a pump 7 is led to a liquid path between the inlet valve 4 and the wheel brake 3, counterflow of working liquid to the master cylinder 2 can be prevented resulting in prevention of kickback of a brake pedal 1.
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