| 摘要 |
A tandem master cylinder has a housing (1) containing two pressure chambers (7, 8) for connection to separate braking circuits. A pressure piston component (4) forms pistons (5, 6) movable in the pressure chambers (7, 8) to supply fluid under pressure to said circuits. A balance piston (30) has opposed surfaces subject to the pressures respectively in said chambers and is movable, in response to a pressure difference between the chambers, so as to reduce said pressure difference. Control valves (13, 14) operate in response to brake actuating movement of the piston component, normally to isolate the chambers from a fluid supply reservoir (18). Disabling means (46, 47) are operable to disable the respective control valves individually so as to prevent pressurisation of one or other of the chambers when actuation of one brake only is required.
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