Hydraulic Vehicle Brake System

A hydraulic vehicle brake system comprising a brake line for conducting a hydraulic pressure medium, which connects a brake pressure sensor attached to a non-pressurized storage vessel to a wheel brake, having a first pressure modulation valve on the inlet side inserted in the brake line between the brake pressure sensor and the wheel brake, having a second pressure modulation valve on the outlet side, which is inserted in a return line connecting the wheel brake to a low-pressure accumulator, a pump disposed on the return line upstream of the low-pressure accumulator, the pump removing the hydraulic pressure medium from the low-pressure accumulator to regulate the brake pressure and conveying it via the first pressure modulation valve on the inlet side to the wheel brake and also via an isolation valve disposed in the brake line upstream of the first pressure modulation valve on the inlet side in the direction of the brake pressure sensor, a pump suction line discharging into the return line between the brake pressure sensor and the low-pressure accumulator, in which pump suction line an electromagnetically opening changeover valve is inserted, wherein when the brake pressure sensor (1) is actuated, the pressure acting on the brake pressure sensor (1) can be fed to the low-pressure accumulator (3), bypassing the wheel brake (2), where desired or necessary.