warning lights

hi all, i have just got a audi a6 1999 and there is a yellow light come on in the dashboard console its next to the fuel lightand looks like ( 0 ) can
anyone tell me what its for, i have a feeling its the brakes as i heard a squeek too, its going back to the garage on friday to be sorted out but was wondering if anyone can confirm what the light is for thanks for any replies stef
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yellow is not a critical warning. it's a warning that the brake pads need replacement.
grts
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