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if it is the brake rotor, then it may be "thinner" than a good rotor. It might also be warped, (wavy) cracked, chipped or pitted. Most of the time it is from excessive wear caused from constant friction with the brake pads. Sometimes caused by excessive heat generated from heavy loads or stoping from fast speeds. If it is the ignition rotor, then the contact area (strip of metal) will usually show pitting and corrosion.

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16y ago

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