The warning lamp lights up when the parking brake is applied. The warning lamp will light up for about 20 seconds if the parking brake is applied with the ignition switched off.
Caution: Vehicle parked too steep
If the warning lamp flashes and the message appears, the brake may not be strong enough to hold the vehicle.
If the warning lamp flashes on its own, the brakes have overheated. The vehicle can roll away, even on a gentle slope.
Parking brake malfunction !
If the indicator lamp 
lights up and the message appears, there is a malfunction in the parking brake.
lights up and the message appears, there is a malfunction in the parking brake.Drive to a qualified workshop without delay and have the fault rectified.
Note
For further information on the parking brake refer to Link.