Patent ID: 6412881
Filing Date: 2002-07-02
Classification: B60T

Abstract:
A braking system for an automotive vehicle having a wheel, comprising:a booster for boosting an operating force acting on a brake operating member; a master cylinder having a housing and including a pressurizing piston which is substantially fluid-tightly and slidably received in said housing and which cooperates with said housing to define a front pressurizing chamber and a rear pressurizing chamber on front and rear sides thereof, said pressurizing piston receiving at a rear end thereof an output force of said booster, a working fluid in said front pressurizing chamber being pressurized by an advancing movement of said pressurizing piston; a fluid passage connected to said front pressurizing chamber of said master cylinder; a brake including a wheel brake cylinder which is connected to said front pressurizing chamber through said fluid passage and which is activated by the fluid pressurized in said front pressurizing chamber, for braking said wheel; and a pressure increasing device activated when a predetermined pressure-increase initiating condition for initiating a pressure increase control is satisfied, to pressurize a fluid in said rear pressurizing chamber, for increasing a pressure of the fluid in said wheel brake cylinder to a value higher than a value before said predetermined pressure-increase initiating condition is satisfied, and wherein said predetermined pressure-increase initiating condition is a predetermined operating condition of said booster in which a braking effect to be provided by said wheel brake cylinder is reduced as compared with a braking effect to be provided when said predetermined operating condition of said booster is not satisfied, and said pressure increasing device is activated, upon detection of said predetermined operating condition, to pressurized the fluid in said rear pressurizing chamber of said master cylinder, so as to at least reduce an amount of reduction of said braking effect.