The Auto Hold function in Volkswagen's new Passat is an extension of the electronic parking brake. The Auto Hold function prevents the vehicle from rolling away accidentally when standing still or when setting off. In this way Auto Hold offers the ultimate in convenience and comfort when driving or setting off, along with enhanced safety. The system is operated via the ABS/ESP hydraulic unit. When the vehicle brakes to a standstill, Auto Hold retains the last-applied braking pressure. The driver can take his/her foot from the brake pedal and all four wheel brakes will remain on. If the ABS wheel speed sensors detect any rolling, the braking force is automatically increased until the vehicle comes to a standstill again. This may be the case if, for example, the driver brakes gently to a stop on an incline. As soon as the driver presses the accelerator again and, in the case of manual gearboxes, releases the clutch, Auto Hold reduces the braking pressure once more. For safety reasons, the function always has to be reactivated by means of a button to the left of the gear lever when the engine has been switched off.