Patent ID: 6425644
Filing Date: 2002-07-30
Classification: B60T

Abstract:
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.