Brake system for a motor vehicle

A brake system for a motor vehicle comprising:

• a brake pressure-generating means, with or without power-assistance, with a non-pressurized storage reservoir, wherein the brake pressure-generating means is connected to a human-machine interface, which by way of a brake fluid serves for generating hydraulic brake pressure for brake devices;
• a first hydraulic unit for connecting the brake pressure-generating means to the brake devices of a first axle, which is equipped with an electric motor, and for transmitting the hydraulic brake pressure through the brake fluid, wherein the first hydraulic unit is electro-hydraulically controllable and operable independently of the brake pressure generated by the brake pressure-generating means;
• and
• a second hydraulic unit for connecting the brake pressure-generating means to the brake devices of a second axle, and for transmitting the hydraulic pressure through the brake fluid;
• a pump with a high-pressure side and a suction side,
• wherein the first hydraulic unit comprises a suction volume, which is connected to the suction side of the pump and which, in an event of a change in the pressure on the suction side of the pump and by way of the brake fluid stored in the suction volume, together with an elastic element, creates a first compensation for a negative pressure resulting from the change in the pressure on the suction side of the pump,
• wherein the suction volume is uninterruptedly connected to the storage reservoir by way of a communicating connecting line, wherein a subsequent compensation created by the storage reservoir occurs over a time period longer than the first compensation created by the suction volume and the elastic element;
• and
• wherein a brake fluid reservoir is provided as the suction volume, and the brake fluid reservoir comprises the elastic element.