| 摘要 |
<p>A modulator assembly incorporates a valve (50, 51) for controlling communication between a master cylinder (2) and a wheel brake (1). When the brake is applied normally the valve (50, 51) acts as a pressure conscious reducing valve, and after a skid signal has been emitted, as a cut-off valve. The valve (50, 51) comprises a differential piston (52) working in stepped bore (53) and normally urged by a spring (54) towards a de-boost piston (10, 11) and the end of the bore which is of greater area, and a one-way valve (56, 57) incorporated in the piston is normally held open by a probe (59) associated with the de-boost piston. The one-way valve (56, 57) comprises a valve member (56) for co-operation with the seating to provide a metering effect when the brake is applied normally, and to isolate the master cylinder from the brake when a skid-signal is present.</p> |
