I am having real problems with power steering in my Audi 100 s4. I fitted a new steering rack and things were fine then pump started making bad grinding noises, I fitted a new one and still the same and I am now on my 4th attempt- I had known good ones and it is still making a noise almost exactly the same, I fully bled all before running and then bled steering after. Does anyone have any idea if there could be a restriction etc? I checked filter bolt and was fine and has all new fluid. Am dreading having to change rack again as I already had to change out dodgy reconditioned unit.
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