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Q: How can I tell if a rotor or drum really needs to be replaced?


By Malachi Nelson

Fri, May 11th, 2012
Posted in All Ask the Expert

Brown Tire, Battery & Transmission • 507-864-2969

A: A rotor must be replaced if it is at or below the minimum thickness specifications or discard thickness stamped on the rotor (this same information can also be found in brake service manuals). Replacement is also necessary if a rotor cannot be resurfaced without exceeding the minimum thickness specification or the discard thickness specification. Replacement is also required if the rotor is cracked or damaged. Replacement may be recommended if a rotor has hard spots, is warped, or has been previously resurfaced for a warped condition.

 A drum must be replaced if it is at or beyond the maximum inside diameter specification or discard diameter stamped on the drum. Replacement is also necessary if a drum cannot be resurfaced without exceeding the maximum diameter specification or discard diameter specification. Replacement is also required if a drum is cracked, damaged, bell mouthed or too far out of round for resurfacing.

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