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.
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: Audi A8 parked too steepIf the warning lamp flashes and the message appears, the brake may not be strong enough to hold the Audi A8. The brakes have overheated. The Audi A8 can roll away, even on a gentle slope.
Press brake pedal to release parking brakeTo release the parking brake, press the brake pedal and simultaneously press the switch 
(alternatively, use the auto release function Link).
(alternatively, use the auto release function Link).
Parking brake!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.