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The W124 floating calipers have a cover for the brake pad sensors. Not sure if your E320 has the same type, but it's good to check if these are firmly clipped to the caliper and not dangling around (and potentially rubbing against the inside of the wheel).
Are the brake hoses or sensor/ABS wires correctly placed so they do not rub?
I just did the brakes on my 190E, similar car & brake design, with all new pads. Kept the rotors and calipers in place. I could see that the brake hose can become twisted when the calipers are removed and reinstalled.
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