| 摘要 |
A braking system for a motor vehicle, having a pressure source, a front wheel brake cylinder and a rear wheel brake cylinder which are connected to the pressure source and produce respective front and rear braking forces for braking respective front and rear wheels of the vehicle, and a pressure reducing valve device for reducing a pressure of the pressure source so that the reduced pressure is applied to the front wheel brake cylinder, wherein a diagnosing device is provided for diagnosing the pressure reducing valve device for abnormality. The diagnosing device may be adapted to diagnose the valve device on the basis of the number of operations to reduce the rear wheel brake cylinder pressure, a pressure difference across the valve device or a change of electrical continuity between electrically conductive valve member and valve seat of the valve device.
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