Method for providing haptic information for a driver of a motor vehicle, and brake system

A brake system for a motor vehicle comprising:

• a master brake cylinder which can be actuated by a brake pedal, with at least one pressure chamber which is connected or connectable to at least one wheel brake,
• a simulation device interacting with the master brake cylinder, which conveys a brake-pedal feel to a driver in a brake-by-wire operating mode, with a release valve connected to the pressure chamber of the master brake cylinder, wherein the simulation device can be switched on and off,
• an electronic control unit configured to carry out the steps of providing a brake-pedal reaction, in response to detecting a predetermined operating state of the brake system in the brake-by-wire operating mode, in the form of a change in the stiffness of the brake pedal which is felt by the driver, implemented by operating the release valve such that the action of the simulation device can be switched on and off, and during the predetermined operating state of the brake system in the brake by wire operating mode, and during actuation of the brake pedal, closing at least one inlet valve that blocks pressure medium from reaching an associated wheel brake of the at least one wheel brake and, when the at least one inlet valve is closed, partially or temporarily closing the release valve to provide haptic feedback via the brake pedal that the at least one inlet valve has closed.

A brake system for a motor vehicle comprising:

• a master brake cylinder which can be actuated by a brake pedal, with at least one pressure chamber which is connected or connectable to at least one wheel brake, with a simulation device interacting with the master brake cylinder, which conveys a brake-pedal feel to a driver in a brake-by-wire operating mode, with a release valve connected to the pressure chamber of the master brake cylinder, wherein the simulation device can be switched on and off,
• an electronic control unit configured to carry out the steps of providing a brake-pedal reaction, in the form of a change in the stiffness of the brake pedal which is felt by the driver, implemented by operating the release valve such that the action of the simulation device can be switched on and off,
• wherein the pressure chamber of the master brake cylinder is hydraulically connected or connectable to a pressure-medium reservoir under atmospheric pressure via the release valve.