Electrohydraulic brake device for a vehicle

Electrohydraulic braking device for a motor vehicle comprises wheel brakes (1a-1d), a braking command device (7) operated by the driver, a hydraulic accumulator (3), a switchable valve arrangement hydraulically coupled between the hydraulic accumulator and the wheel brakes, a control device supplying the wheel brakes with braking pressure depending on an electrically and/or electronically determined position of the braking command device through actuation of the valve arrangement, and a main brake cylinder (12) operated by the braking command device and hydraulically coupled to the wheel brakes via the valve arrangement. A hydraulic connection via the valve arrangement between the main brake cylinder and the wheel brakes in a de-activated state is opened to transfer brake pressure from the main cylinder to the wheel brakes on failure of the control device. In the de-activated state a connection to the hydraulic accumulator to increase braking force is opened by the brake pressure. Preferred Features: The switching valve (22) is a pressure-regulating valve, a differential pressure valve, or a check valve.