EBV provides control of brake force distribution. A failure of the driver's system is warned by the simultaneous operation of the brake and ABS warning lamps while driving (see Section Instrument cluster, meters and control lamps and indicator lights), in addition, the alarm buzzer is activated for 5 seconds. In the event of a faulty EBV system, an alarm buzzer will sound every time the foot brake pedal is depressed at a speed of over 40 km/h - the vehicle should be immediately driven to a Mercedes-Benz workshop for diagnosis and necessary remedial repairs.