| 摘要 |
Hydraulic brake systems are known which include master cylinders, wheel brake cylinders and wheel slip control apparatus in which a fluid flow from a fluid source to the pressure chamber of the master cylinder is controlled by a valve device. The wheel slip control apparatus controls valves and modulates the pressure in the associated wheel brake cylinder in the event of an imminent locked condition of a wheel. In the known systems the cup seal of the master cylinder is subjected to excessive loads and, moreover, it is not possible to determine if the cup seal leaks. Therefore, in accordance with the present invention a valve device is provided coupled to the master cylinder pressure chamber and the front wheel brake cylinders which is opened dependent on a differential of pressure between the pressure in the master cylinder pressure chamber and the pressure in the front wheel brake cylinders, with the pressure in the front wheel brake cylinders being required to be lower than the pressure in the master cylinder pressure chamber.
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