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This document addresses the potential causes of the two most common warranty returns for brake drums:
"out-of-round" and "cracked" as well describing what to look for to help diagnose these issues:
Common Brake Drum Warranty Returns
This document defines when to replace your brake drum: Guidelines for Brake Drum Replacement This document shows the importance of corosion removal from Aluminum Hubs before installing brake drums.
Corrosion on Aluminum Hubs
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