Abstract: A hydraulic brake system with anti-lock control, in particular for automotive vehicles, comprising a braking pressure generator (18), at least one wheel brake (5), an auxiliary-pressure pump (1), a low-pressure accumulator (22), and a shut-off valve and outlet valve (12, 7) for controlling the braking pressure. The shut-off valve is controlled to permit or prevent pressure fluid flow between the braking pressure generator and the wheel brake by a stepped piston positioned in a stepped bore in a housing. Initially, the stepped-piston maintains the shut-off valve open to permit pressure fluid flow. During slip control operation when pressure fluid from the low-pressure accumulator is delivered to the stepped-bore by the auxiliary-pressure pump, the stepped-piston closes the shut-off valve to prevent pressure fluid flow.