If the warning lamp lights up, there is a fault in the brake system. You can press the SET 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 ESC indicator lamp 
light up together with the brake warning lamp and this driver message appears, the ABS, ESC and brake force distribution systems have failed WARNING!.
and ESC indicator lamp light up together with the brake warning lamp and this driver message appears, the ABS, ESC and brake force distribution systems have failed WARNING!.Drive to a qualified workshop without delay and have the fault corrected WARNING!.
Parking brake system fault! See owner's manual- If the warning lamp and the message appear after you switch on the ignition when the vehicle is stationary, please check whether you can release the parking brake. If the parking brake cannot be released you should obtain professional assistance. If the parking brake can be released but the warning lamp/message still appears, drive to a qualified workshop without delay and have the fault rectified.
- If the warning lamp and the message appear while driving, there may be a malfunction in the parking brake auto release or the emergency brake functions. You may not be able to apply or release the parking brake. Do not park the car on a gradient. Obtain professional assistance.
- 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 ESC 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.