If the warning lamp lights up, there is a fault in the brake system. You can press the CHECK button to obtain a message explaining the fault.
Stop vehicle and check brake fluid levelStop the vehicle and check the brake fluid level Link. You should obtain professional assistance.
Warning! Fault in brake system. Contact workshopIf the ABS indicator lamp 
and ESP indicator lamp 
light up together with the brake warning lamp and this driver message appears, the ABS, ESP and brake force distribution systems have failed WARNING!.
and ESP indicator lamp light up together with the brake warning lamp and this driver message appears, the ABS, ESP and brake force distribution systems have failed WARNING!.Drive to a qualified workshop without delay and have the fault corrected WARNING!.
- Before opening the bonnet and checking the brake fluid level, observe the warning information on Link.
- If the brake fluid level in the reservoir is too low, this could result in an accident. Stop the vehicle and do not drive on. You should obtain professional assistance.
- If the brake warning lamp lights up together with the ABS indicator lamp and the ESP indicator lamp, this can mean that the control function of the ABS is not working. As a result the rear wheels can lock relatively easily when braking. This could cause the tail of the vehicle to skid sideways. Drive carefully to the nearest qualified workshop and have the fault rectified.