Vehicle brake system

A method for controlling a vehicle brake system comprising a brake assembly providing a service brake and a parking brake having a brake disc assembly in common, a service brake circuit connectable to the service brake, and a parking brake circuit connectable to the parking brake, the method comprising

• controlling the vehicle brake system so as to assume a first state in which a fluid communication is provided between the parking brake and a pressurising arrangement, for keeping the parking brake released, and
• controlling the vehicle brake system so as to assume a second state in which the parking brake circuit is drained for applying the parking brake,
• draining the service brake circuit in the second state for avoiding overload of the brake disc assembly, wherein the service brake circuit is drained while the parking brake circuit is drained.

A controller for a vehicle brake system, the vehicle brake system comprising a brake assembly providing a service brake and a parking brake having a brake disc assembly in common, a service brake circuit connectable to the service brake, and a parking brake circuit connectable to the parking brake, the controller being configured

• to control the vehicle brake system so as to assume a first state in which a fluid communication is provided between the parking brake and a pressurising arrangement, for keeping the parking brake released, and
• to control the vehicle brake system so as to assume a second state in which the parking brake circuit is drained for applying the parking brake,
• wherein the controller is configured to control the vehicle brake system so that the service brake circuit is drained in the second state for avoiding overload of the brake disc assembly, and wherein the controller is configured to control the vehicle brake system so that the service brake circuit is drained in the second state while the parking brake circuit is drained.