| 摘要 |
A braking system including (a) a hydraulically operated brake cylinder for operating a brake, (b) a master cylinder operable according to an operation of a manually operable brake operating member, to pressurize a working fluid, (c) a master-cylinder cut-off valve connected to the master cylinder, (d) a high-pressure source such as a power-operated pressure-control cylinder disposed between the master-cylinder cut-off valve and the brake cylinder and operable according to the operation of the brake operating member, to pressurize the fluid, the high-pressure source including a power-operated drive device and a pressure-control cylinder having a control piston which is operable by the power-operated drive device and which partially defines on respective front and rear sides thereof a front control-pressure chamber connected to the brake cylinder, and a rear pressure chamber which is held in communication with the master cylinder, and (e) a braking-pressure control device (200) operable to control the power-operated drive device, to thereby control the pressure of the fluid in the brake cylinder.
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