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okay....my wifes x3....it was fine last time i drove it...but my wife comes home and she said that she had to power brake...and now the wheel vibrates and the pedal vibrates!! it has 107,000 on it and it has the original rotors on it...the pads have been replaced and one of the calipers were replaced....my thought is possibly the master cylinder???? but it could also be the rotors considering it doesnt have power brakes you would feel the warped rotors on the pedal....but that doesnt make sense either because it would have been a gradual process....right??? any feed back would be appreciated! thanks :smiley_ac