| 摘要 |
The invention relates to a motor vehicle brake system with a tandem brake master cylinder (53) which can be actuated by a brake pedal (54) by way of a vacuum brake booster (17). The tandem brake master cylinder (53) is connected to wheel brake cylinders by way of brake lines (13, 14, 15, 16) of a first and a second brake circuit (55 and 56 respectively), in which normally open hydraulic control valves (21, 22, 23, 24) are provided. A brake slip control circuit, to which signals corresponding to the rotational behaviour of the vehicle wheels are fed by sensors assigned to the vehicle wheels, delivers switching signals to the hydraulic control valves (21, 22, 23, 24) as a function of the rotational behaviour of the vehicle wheels. A pressure modulator device (11, 12, 12') has two vacuum-operated volume sensors (12, 12'), controllable by way of corresponding pneumatic control valves (33, 34), each of which sensors is connected to one of the two brake circuits (55 or 56). The volume sensors (12, 12'), acted upon by a common vacuum actuating unit (11), are arranged parallel to one another in a pressure modulator block (10), in which a hydraulic valve block (20) comprising the hydraulic control valves (21, 22, 23, 24) and a pneumatic valve block (30) comprising the pneumatic control valves (33, 34) are incorporated. <IMAGE>
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