| 摘要 |
To prevent overbraking of the vehicle rear wheels, brake pressure control valves are employed comprising essentially a stepped piston and a valve. A control piston is provided which prevents closing of the valve in the event of failure of a brake circuit. The prior known arrangements are expensive to manufacture and require a large number of seals. The invention, therefore, provides a brake pressure control valve in which an annular piston is provided with a bore which is penetrated by the control piston. A first of the annular piston transverse surfaces is subjected to the pressure of the front wheel brake circuit while a second of the annular piston transverse surfaces is subjected to the regulated pressure of the rear wheel brake circuit. The control piston's end adjacent the valve bears against the annular piston in the direction of a control spring. |
