Can you post a picture of what you are looking at?

The E70 has a bunch of different warnings to include "Service" notifications. There is a Service Notification for flushing the brake fluid every 2 years.

Make sure what you think is a brake fluid warning is not just a 2 year Brake Fluid Flush notification.

You can access the Errors/Service notifications in the iDrive system.

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2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.