Technique for operating a brake system in a μ-split situation

Proposed is a technique for operating a hydraulic motor vehicle brake system in an operating situation which requires the formation of a hydraulic pressure difference at opposite wheel brakes of a vehicle axle. Here, each wheel brake is assigned a first slip regulating valve device for decoupling the respective wheel brake from a hydraulic pressure generator, and a second slip regulating valve device for dissipating hydraulic pressure at the respective wheel brake. A method implementation of this technique comprises the steps of building up a hydraulic pressure at the opposite wheel brakes during the course of a braking process, detecting a requirement for forming a hydraulic pressure difference at the opposite wheel brakes, actuating one or more of the slip regulating valve devices assigned to the opposite wheel brakes so as to form the hydraulic pressure difference by virtue of different hydraulic pressures being set at the opposite wheel brakes, and, in reaction to a driver demand, increasing the hydraulic pressure at the opposite wheel brakes, including the wheel brake at which a relatively low hydraulic pressure is to be set, while maintaining the hydraulic pressure difference by transferring hydraulic fluid from the hydraulic pressure generator via the first slip regulating valve devices to the opposite wheel brakes.