Shine a light at the reservoir and it should be obvious where the marks are - I wouldn't drive it again until you've checked this. It may be as Ian suggested it's just got low brake pads and the fluid level has dropped enough, but with brakes it's always advisable to confirm the obvious before assuming it's nothing to worry about
A leak would be rare without obvious loss of braking performance (you'd expect one circuit of the split to stop functioning and for it to behave very strangely under braking as a result)
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
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