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1993 Audi 100 Quattro Questions

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I have spongy breaks and have to press almost to the floor to stop. The emergency break doesn't work either. I've had two mechanics tell me the rear breaks are out. One says replacing the master cylinder will fix it. The other says the rear calipers need to be replaced. What is the most likely scenario? Thanks for your input.
GO the black on goes on the lower block driver side but i can not find where the other port is?? i did not take it off and dont know who did car has a no start problem!!!
how do i add transmission fluid?
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