| 摘要 |
A hydraulic brake apparatus for a vehicle includes a first hydraulic passage for supplying pressurized brake fluid from a master cylinder to wheel brakes without passing through a hydraulic pump, a first opening and closing electromagnetic valve interposed in the first hydraulic passage for opening and closing the first hydraulic passage, a second hydraulic passage for supplying brake fluid from the master cylinder to the suction side of the hydraulic pump, and a second opening and closing electromagnetic valve interposed in the second hydraulic passage for opening and closing the second hydraulic passage. A passage cross sectional adjusting valve is interposed in the second hydraulic passage and decreases the passage cross sectional area of the second hydraulic passage to suppress the transmission of a hydraulic pulsation generated in a suction side of the hydraulic pump to the master cylinder when the brake pedal is depressed. The passage cross sectional adjusting valve increases the passage cross sectional area of the second hydraulic passage to decrease the resistance for suctioning by the hydraulic pump when the brake pedal is not depressed.
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