Patent ID: 8240778

Claim:
A hydraulic trailer brake system comprising a device for braking wheels of a trailer; a controllable pressure generator for wheel-individual or axle-individual activation of wheel brakes; a hydraulic brake force transmission device assigned to the device and connected to the wheel brakes via brake lines, the brake force transmission device including a reservoir for a pressure medium and a brake master cylinder; an electronic control unit or a regulation unit which receives energy via a supply unit, wherein at least two wheel brakes are connected to the brake master cylinder via a first isolating valve arranged in the brake lines and via a first changeover valve, in that the wheel brakes are assigned at least one first inlet and one first outlet valve, a first electrically activatable pressure medium pump provided in a bypass line, downstream of the first changeover valve and the first isolating valve, the suction side of the electrically activatable pressure medium pump connected to the first changeover valve, to at least one first outlet valve and to a first low-pressure accumulator, and the delivery side of the first electrically activatable pressure medium pump connected to the first isolating valve and to at least one first inlet valve, and a stabilizing coupling connected via a second pressure medium pump to actuators which can vary a tension force of the stabilizing coupling between the trailer and a traction vehicle when the pressure medium pump conveys pressure medium out of the reservoir and into or out of the actuators.