| 摘要 |
<p>A braking pressure control unit having discharge valves (15, 16) which are provided with valve means for opening and closing a passage (14) into which a control fluid pressure from a control chamber is discharged and which are set in the discharge passage (14), the pressure of the control fluid in the control chamber being reduced by opening the discharge valves to thereby directly or indirectly reduce the vehicle braking force, characterized in that the means for opening and closing the discharge valves (15, 16) consist of at least two means connected in series to the discharge passage, whereby, even when either one of these valve opening and closing means has lost from certain causes its functions of shutting off the discharge passage (14), the remaining normal valve opening and closing means is operated to prevent the leakage of the control fluid pressure from the control chamber.</p> |
