RE: Brakes scratch
Power slotted rotors will always be noisy compared with a blank disc. They are slotted and "catch" the pad, making some very disturbing noises when coming down off the highway, but it's often more of a growling.
Squealing is due to metal vibrating. As Hiwords said, get some anit-squeal for brakes and apply it to the backsides of the pads, guide clips, and slider pins. Clean the calipers really well of built-up brake dust and rust before reassembly.
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01 A4 1.8T Quattro Sport
Eibach, Hotchkis, Upsolute, Borla
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