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1991 Audi Coupe Quattro Questions

Get answers to questions about your 1991 Audi Coupe Quattro at RepairPal. Find solutions, diagnose problems and get back on the road.

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I have a problem with the brake system I replaced the brake accumulator and the master cylinder, but the brake pedal is hard and difficult to stop, I haved to press hard and lock the brakes up, so vibration from the anti-lock system occurs. This is a hydro boost brake system so the boost comes from the power steering.