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Old 03-11-2014, 11:56 AM   #1
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Noticed on my new front rotors

Just had the front brakes replaced on my 2000S and noticed that the drilled holes in the rotors are slightly beveled whereas the old rear rotors are drilled but not beveled. I don't recall that the old fronts were either. Same on your S's? Part number starts with 996...

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Old 03-11-2014, 12:27 PM   #2
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Its a little hard to tell but my 2001 S has slightly beveled holes in the rotors.

The bevel will be less visible as it gets worn off.

Fronts


Rears
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Old 03-11-2014, 12:38 PM   #3
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One goal of the slight beveling is to reduce the likelihood (or maybe delay) the formation of cracks that emanate from the drilled holes. It is surprising that the OEM rotors didn't have this feature.
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Old 03-11-2014, 01:31 PM   #4
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Aha! That must be it! Thanks!
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Old 03-11-2014, 03:37 PM   #5
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I didn't stay in a Holiday Inn Express last night but I believe " drilled " rotors are manufactured two different ways. One is when the rotor is cast the holes are part of the casting process. These are more costly to make and less prone to cracking and are not chamfered. The second way is after the rotors are cast they are then machined/drilled. Less costly but more prone to cracking so part of the drilling process also bevels the edge of the holes.
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Old 03-12-2014, 06:13 AM   #6
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I believe that cast in hole theory is a common myth. There was actually a bounty offered on corner-carvers.com to anyone who could provide evidence of a rotor produced this way.
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Old 03-12-2014, 08:16 AM   #7
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Quote:
Originally Posted by stephen wilson View Post
I believe that cast in hole theory is a common myth. There was actually a bounty offered on corner-carvers.com to anyone who could provide evidence of a rotor produced this way.
There certainly are photos of rotors where the hole clearly shows signs of casting. Most seem to be high-end OEM. Not sure about aftermarket.
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Old 03-12-2014, 07:21 PM   #8
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To the op, a good question is what brand rotors did you buy?
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Old 03-13-2014, 04:11 AM   #9
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There certainly are photos of rotors where the hole clearly shows signs of casting. Most seem to be high-end OEM. Not sure about aftermarket.
I'd love to see it. On that other site, no one could source any conclusive evidence.

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