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Originally Posted by rfuerst911sc
I may be way off on this but are all drilled rotors actually drilled ? What I mean is I thought I read somewhere on the net or car forums that some " drilled " rotors actually have the holes cast in when the rotors are being made. Supposedly the cast in holes do not exhibit the hairline cracking like rotors where the holes are machined after casting the rotors. Anyone else heard/seen that ?
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You are correct; rotors with the holes cast in (such as Porsche OEM rotors) are much less prone to cracking than aftermarket rotors with holes drilled in.
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