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Q:

Break Rotor on 1991 Buick Century

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What is the minimum thickness of break rotor?
(1) Answer
Standard duty: .830" (21.08mm) is the minimum thickness to resurface to; discard specification is .815" (20.7mm)

Heavy duty: .972" (24.7mm) is the minimum thickness to resurface to; discard specification is .957" (24.3mm)