METHOD AND APPARATUS FOR CONTROLLING REAR WHEEL BRAKING FORCE

摘要

A method and apparatus for controlling braking force such that a greater amount of braking force is distributed to rear wheels at normal times, while preventing the earlier locking of the rear wheels by reducing the amount of braking force distributed thereto when the road surface is slippery, comprising a pressure sensor (74) for detecting the pressure of a master cylinder, proportioning valves (571, 572) provided along flow paths connecting the master cylinder and rear wheel cylinders and adapted to operate such that the ratio of the wheel cylinder pressure to the master cylinder one becomes smaller in an area where the master cylinder pressure exceeds a predetermined one, normally-opened on-off valves (62, 63) for bypassing the both valves, and controlling means (71), which is adapted to close the on-off valves and operate the porportioning valves when the master cylinder pressure detected by the pressure sensor exceeds a set pressure which decreases in accordance with slipperiness of the road surface.