| 摘要 |
PURPOSE: To constitute a cylinder, a separating piston and a two-port two- position valve for a hydraulic type motorcar braking device simply and prevent the leakage loss of pressure liquid. CONSTITUTION: A two-port two-position valve 255 is constituted of a seal lip 253 of a secondary chamber side lip seal ring 251 and a first valve port 254, communicated with a master cylinder formed in a cylinder 237. A second valve port 262 is provided with an interval corresponding at least to the maximum moving distance of a separate piston 242 from the first valve port while the second valve port 262 is connected to a tank for the master cylinder at all times. A second lip seal ring 259, which belongs to the second valve port, is provided.
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