having problems with parking brake light and abs light coming on. would like to

Hello, The parking brake is an electronically actuated disc brake for the A8. This means it uses the normal service brakes to hold the vehicle still, but it has a motor to build its own clamping force. This means that if the brakes are working properly, the issue is likely electrical. You may have a corroded connector, failed parking brake actuator, bad parking brake control module, or faulty wiring. The best case scenario is that the connector was not plugged back in or is dirty. Otherwise, a scan tool which can read body codes and enhanced OBD codes may be needed to identify the issue.