| 摘要 |
A pressure control valve unit for a hydraulic brake device is provided which is highly effective in reducing noise, vibration, and harshness. The pressure control valve unit comprises a normally-open inlet valve and a switching valve sequentially located in the main brake line in a housing cavity between the master cylinder and the wheel cylinder(s). During brake pressure control, the difference in pressure acting on the master cylinder side and that on the wheel cylinder side causes the switching valve to switch to a constricted channel, thereby noticeably reducing the amount of noise, vibration, and harshness.
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