Hydraulic brake system

A hydraulic brake system for a vehicle, comprising:

• a wheel brake device provided for a wheel of the vehicle and configured to generate a braking force based on a pressure of a working fluid supplied to the wheel brake device;
• a first brake system that includes a high-pressure source device including a first pump device and an accumulator that accumulates the working fluid ejected from the first pump device, the first pump device being configured to be driven intermittently such that a pressure of the working fluid accumulated in the accumulator is not lower than a set lower limit pressure and not higher than a set upper limit pressure, the first brake system being configured to supply, to the wheel brake device, the working fluid whose pressure is regulated in dependence on the high-pressure source device;
• a second brake system including a second pump device and configured to supply, to the wheel brake device, the working fluid whose pressure is regulated in dependence on the second pump device;
• and
• a main power source configured to supply electricity to the first brake system and the second brake system,
• wherein the hydraulic brake system further comprises an auxiliary power source configured to supply electricity to the first brake system when a failure occurs in the main power source,
• wherein the first pump device is continuously driven when the failure occurs in the main power source irrespective of the pressure of the working fluid accumulated in the accumulator, and
• wherein the hydraulic brake system is configured such that, in automated driving of the vehicle, the auxiliary power source in place of the main power source supplies the electricity to the first brake system even when no failure occurs in the main power source.