Patent ID: 8215464
Filing Date: 2012-07-10
Classification: B60T

Abstract:
1. Hydraulic unit for a motor vehicle brake system operating on a recirculation principle, said hydraulic unit comprising: a first pressure medium connection on the hydraulic unit for a braking pressure generator, pressure control valves in the form of inlet and outlet valves in a brake circuit present at least in part in the hydraulic unit, which brake circuit is connected via second and third pressure medium connections on the hydraulic unit to at least one pair of wheel brakes, a pump suction conduit arranged in the hydraulic unit downstream of the outlet valves, a low-pressure accumulator connected to the pump suction conduit, a pressure-retaining valve arranged in the hydraulic unit downstream of the low-pressure accumulator, via which pressure-retaining valve the pump suction conduit on one side is connected to a pump and on the other side is separated from the first pressure medium connection leading to a braking pressure generator via a change-over valve which is closed in a normal position, and a prefilling location in each brake circuit which opens into the pump suction conduit for receiving brake fluid, wherein the prefilling location opens into the pump suction conduit between the pressure-retaining valve and the change-over valve.