what makes the little red brake light come one?

[Audi Sport]

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All the fluids are well above minimum level and that light comes on wether I
use the brakes or not. One thing to note though is that the light used to come
on sometimes when I'd turn the car on but as soon as I would tap the brakes it
would go off. I don't know if that helps any but I thought I'd throw it in.

My original post is below.





If you aren't low on brake fluid and the emergency brake is released, under
what other conditions would the little red "BRAKE" light come up on the bottom
of the dash. It just keeps comming and going and most of the time it keeps
flickering.

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