Rotors too big? *Pics*

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  #16  
Old 11-10-2009, 04:12 PM
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Rust tells you alot about the QUALITY of the cast iron poured to make your rotor.

The SAE acknowledges 9 different quality grades.
Here's a little rotor education but just an intro another few thousand pages of research and reading is necessary.
http://www.sae.org/events/bce/tutorial-ihm.pdf
 
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Old 11-25-2009, 11:15 PM
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I had my stock rotors resurfaced, and it turns into that color in same exact place. It is definitely normal.
 
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