Patent ID: 8777332

Claim:
A braking control system comprising a first source of pressurised fluid, a second source of pressurised fluid, a modulator, a brake actuator, and a plurality of valves that includes a first valve and a second valve that are each connected to the first source of pressurized fluid and the second source of pressurized fluid, the modulator having a supply inlet connected to the first valve via a first fluid flow line, a control inlet connected to the second valve via a second fluid flow line, a delivery port connected to an inlet of the actuator, and an exhaust outlet which vents to a low pressure region, the modulator being operable to move between a build position in which flow of fluid from the supply inlet to the delivery port is permitted whilst flow of fluid through the exhaust outlet is substantially prevented, and an exhaust position in which flow of fluid between the delivery port and the exhaust outlet is permitted, whilst flow of fluid through the supply inlet is substantially prevented, wherein the second source of pressurized fluid is connected to the first valve and the second valve at least in part by a third fluid flow line over which flow of fluid is provided to both the first valve and the second valve from the second source of pressurised fluid, the first valve is movable between a first configuration in which the first source of pressurised fluid is in fluid communication with the first fluid flow line and a second configuration in which the second source of pressurised fluid is in fluid communication with the first fluid flow line, and the second valve is movable between a first configuration in which the first source of pressurised fluid is in fluid communication with the second fluid flow line and a second configuration in which the second source of pressurised fluid is in fluid communication with the second fluid flow line.