| 摘要 |
<p>The hydraulic brake system having at least one wheel brake is adapted to be pressurized by a master brake cylinder actuated by a hydraulic power booster. An auxiliary pressure is adjustable in a pressure chamber of the hydraulic power booster by means of a brake valve. Interposed between an auxiliary pressure source and the brake valve is a pressure-reducing valve that is controllable by the auxiliary pressure and contains a valve controlling a passageway, the valve being acted upon by the auxiliary pressure to open the passageway. To simplify the construction of the pressure-reducing valve, the closure member of the valve is exposed to the reduced pressure in the pressure-reducing valve such that a force related to the valve seat surface will be exerted on the closure member in the closing direction of the passageway of the pressure-reducing valve.</p> |
