Apparatus and method for alerting a driver in a vehicle

A method for alarming a driver by - detecting an emergency situation to generate a corresponding detection signal, and - outputting a warning signal to the driver based on the detection signal, wherein the warning signal comprises a shock which is applied to the driver and / or the limbs, the jerk to the entire vehicle and thus also on the driver is applied, characterized that the back is realized by a pressure reduction in the brake system and that built up in the brake system from a time t0, the brake pressure p up to a slight pressure p1, the vehicle is not braked noticeably, and that after reaching the braking pressure p1 at time t1 one or more valves of the brake system are opened, so that the braking pressure is reduced with a steep gradient, which is substantially steeper than the gradient to build up the brake pressure p1, so that a jolt to the rider is obtained.