IMPROVEMENTS IN HYDRAULIC BRAKING SYSTEMS FOR VEHICLES

摘要

In a braking system in which brake application is controlled electronically by the use of electrically controlled actuators (5, 6), a pedal-operated hydrostatic master cylinder (31) is connected to a brake (12) through at least one of the actuators (5). A first normally open valve (7) is provided so that upon failure of the electronic means (15a, 15b, 60), the valve opens to permit hydrostatic pressure to apply both the front wheel brakes (1, 2) by putting them in fluidic communication. A second normally-open isolator valve (44) can be provided which is closed during normal brake operation to prevent hydrostatic pressure from being utilised to apply the brake, the valve opening automatically upon failure of the electronic means (15a, 15b, 60).