| 摘要 |
In a pneumatically-operable actuator assembly for a vehicle hydraulic braking system a control valve assembly comprises a first valve responsive to a signal of deceleration for controlling communication between an inlet passage for connection to a supply of air under pressure and a modulator chamber through a supply chamber, and a second valve downstream of the first valve for controlling communication between the modulator chamber and an exhaust passage and responsive to pressure in the supply chamber, the first valve being substantially smaller than the second valve whereby the pressure in the modulator chamber can be reduced rapidly in response to a relatively small reduction in the pressure in the supply chamber.
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