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A braking pressure control apparatus for a hydraulically operated brake, including a first hydraulic system having a first hydraulic pressure source power-operated to pressurize a working fluid and capable of controlling the fluid pressure, for operating the brake, a second hydraulic system having a

A braking pressure control apparatus for a hydraulically operated brake, including a first hydraulic system having a first hydraulic pressure source power-operated to pressurize a working fluid and capable of controlling the fluid pressure, for operating the brake, a second hydraulic system having a second hydraulic pressure source operable by an operating force acting on a manually operable brake operating member, to pressurize the working fluid to a pressure higher than a level corresponding to the operating force, for operating the brake, a switching device operable to selectively establish a first state in which the brake is operated with the pressurized fluid delivered from the first hydraulic pressure source, and a second state in which the brake is operated with the pressurized fluid delivered from the second hydraulic pressure source, and a diagnosing device operable to diagnose the second hydraulic system on the basis of the fluid pressure in the second hydraulic system.

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1. A braking pressure control apparatus for a hydraulically operated brake, comprising:a first hydraulic system including a first hydraulic pressure source which is power-operated to pressurize a working fluid and capable of controlling a pressure of the pressurized fluid, for operating said brake w

1. A braking pressure control apparatus for a hydraulically operated brake, comprising:a first hydraulic system including a first hydraulic pressure source which is power-operated to pressurize a working fluid and capable of controlling a pressure of the pressurized fluid, for operating said brake with the pressurized fluid delivered from said first hydraulic pressure source; a second hydraulic system including a manually operable brake operating member, and a second hydraulic pressure source which is operable by an operating force acting on said brake operating member, to pressurize the working fluid to a pressure higher than a level corresponding to said operating force, for operating said brake with the pressurized fluid delivered from said second hydraulic pressure source; a switching device operable to selectively establish a first state in which said brake is operated with the pressurized fluid delivered from said first hydraulic pressure source, and a second state in which said brake is operated with the pressurized fluid delivered from said second hydraulic pressure source; and a diagnosing device operable to diagnose said second hydraulic system on the basis of a pressure of the fluid in said second hydraulic system.