Patent ID: 6390566
Filing Date: 2002-05-21
Classification: B60T,B62L

Abstract:
A braking system for vehicle comprising:a first brake member; a second brake member independent from said first brake member; a master cylinder adapted to be operated by an operator, said master cylinder having an output part which is connected to said first brake member; a hydraulic pressure source; and a proportional pressure intensification valve for drawing a boosting hydraulic pressure in proportion to a hydraulic pressure outputted from said master cylinder from said hydraulic pressure source into a hydraulic pressure boosting chamber thereof, wherein said hydraulic pressure boosting chamber of said proportional pressure intensification valve is connected to said second brake member, wherein said vehicle comprises front and rear wheel brake mechanisms, at least one of said front and rear wheel brake mechanisms has a primary wheel cylinder and a secondary wheel cylinder which are adapted to cause said at least one said front and rear brake mechanism to operate when said primary and secondary wheel cylinders are supplied with hydraulic pressure, and said first brake member s said primary wheel cylinder of said at least one of front and rear wheel brake mechanisms, and said second brake member is said secondary wheel cylinder of said at least one of front and rear wheel brake mechanisms wherein said vehicle is an automotive two-wheeled vehicle, said at least one of said front rear wheel brake mechanisms comprises first and second disc brakes disposed on both sides of the respective wheel and wherein a wheel cylinder of said first disc brake is made to function as said primary wheel cylinder, while a wheel cylinder of said second disc brake is made to function as said secondary wheel cylinder.