Patent ID: 6099087
Filing Date: 2000-08-08
Classification: B60T

Abstract:
An hydraulic braking system for vehicles in which braking is provided under the control of electronic means by assessing a driver's braking demand electronically and by the use of at least a first and second electrically controlled actuator, said braking system comprisinga pedal-operated hydrostatic master cylinder connected to a first front wheel brake for a first wheel through said first electrically controlled actuator, said second electrically controlled actuator is connected to a second front wheel brake for a different wheel,a first isolator valve adapted to permit fluid communication between said first front wheel brake and said second front wheel brake, where inboth said first and second actuators comprise a piston working in a bore to pressurize fluid in a pressure chamber, andsaid the first electrically controlled actuator only incorporates a normally open second isolator valve which is closed during normal brake operation but which is otherwise open to define a first flow path through said first actuator and to said brake up on failure of said electronic means, and by said first isolator valve being open in the event of failure of said electronic means to define a second flow path through which fluid from said first flow path can pass to apply said second front wheel brake independently of operation of said second actuator and by flow through said pressure chamber in said second actuator.