Hydraulic braking systems for vehicles

Claim 1

An hydraulic braking system for a vehicle having brakes on wheels on front and rear axles, comprising a pedal-operated master cylinder for applying said brakes, an electrically driven pump, speed sensors for sensing the behaviour of respective wheels, an electronic control module for emitting electric currents in response to signals from said speed sensors, and solenoid-controlled valve means for achieving brake application in a traction control mode and brake re-application in an anti-lock mode in response to energising currents from said electronic control module in turn responsive to signals from said speed sensors, wherein separate first solenoid-controlled valves are located in brake lines between said master cylinder and each of said brakes on said front and rear wheels of the vehicle, pressure sensing means are disposed in each respective said brake line and said solenoid-controlled valves are adapted to operate independently of each other to achieve independent pressure levels in the front and rear brakes by operation of said pump in response to signals supplied to said electronic control module from said pressure sensing means in each respective brake line.