| 摘要 |
A hydraulic dual-circuit brake system, with an anti-skid system (ABS) and traction control (ASR) for motor vehicles having a four-channel hydraulic unit with control valves, a return pump with two separate pump elements for each brake circuit, and two low-pressure reservoirs connected to the inlets of the pump elements. For supplying brake pressure in the traction control mode, at least one brake fluid reservoir is provided, which communicates with a pump element assigned to a brake circuit having at least one driven wheel, and a reversing valve is disposed in each connecting line between the master brake cylinder and the outlet of such a pump element. For the sake of problem-free initiation of braking during the traction control mode without the danger of unstable driving conditions, the brake fluid reservoir embodied as an active, controllable reservoir, and the reversing valve is embodied such that in its reversed position a check valve having a blocking direction toward the master brake cylinder is operative.
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