Texholdem, were the replacement rotors genuine MB rotors or aftermarket? It's possible one (or both) of the new front rotors is out of balance, or slightly warped. A runout check with a dial indicator will show if the rotors are warped.

Replacing front rotors should not affect the wheel bearings. If the wheel bearings were OK before the recent work they should be the same now.

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Fred Hoelzle