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      01-18-2012, 04:57 PM   #3
king of the hills
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Drives: 335i coupe
Join Date: Dec 2006
Location: Denver, CO

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1994 530i  [4.25]
2007 335i Coupe  [4.07]
The surface cracks are called 'crazing' cracks, which means your rotors got very very hot. Its actually fairly normal to see on rotors that have seen track days. It doesn't necessarily mean they are shot. As long as there are no cracks across the rotor from inside out or between the drilled holes, you do not need to replace.
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