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If it is a "used" drum it could have been involved in an impact of some sort. Again if it is a used drum, it may have been "turned" or "refaced" too many times, leaving it out of "true" and too thin. If the drum again is used, it may have been heated during continued stopping and then subjected to water on the road. The drum may simply "warp" thus giving you a pulsation or unequal braking

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Q: What would cause your new brake drum being out of round I replaced the shoes and put the new drum on and tightened by hand and now the parst guy says the drum is out of round.?
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