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Drum Brake System

Brake Drums
All brake drums and rotors have a discard dimension cast into them. This is a wear dimension and not a refinish dimension. Any drum or rotor which does not meet the specification should be replaced.
Discard Diameter 8.909 Inch (in)
Inside Diameter 7.84 - 7.890 Inch (in)
Maximum Re-bore Diameter 8.879 Inch (in)
Runout 0.006 Inch (in)
Maximum Scoring 0.06 Inch (in)