| 摘要 |
A hydraulic pressure source apparatus for a braking system, including a cylinder housing, a pressurizing piston fluid-tightly and slidably received within the cylinder housing and cooperating with the cylinder housing to define a front pressurizing chamber and a rear assisting pressure chamber on respective front and rear sides of the pressurizing piston, so that the pressurizing piston is advanced in response to an operation of a brake operating member, to pressurize a working fluid in the front pressurizing chamber, and an electrically controlled assisting pressure control device (64) for controlling an assisting hydraulic pressure in the rear assisting pressure chamber, such that a boosting ratio which is a ratio of an output to an input of the pressurizing piston is controlled to be a predetermined value.
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