Anyone who can tell me what this means?


This sign has occured every now and then. It has been three short beeps, and a few more flashes.
Today the sign appeared as usual, but this time it didnt stop flashing. I stoped the car immediately and checked for brakefluid. there was enough fluid, and the car was on a regular EU-test here in norway for less than a month ago, then without any marks/comments about the brakes. Anyone who can tell me what to check for?

Here today, gone tomorrow, going fast in my V8 quattro!