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Old 03-06-2015, 11:52 AM   #1
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BOX S Brake Rotors

Does anybody know why the service manual prohibits machining the BOX S rotors?

The base car rotors can be turned and the minimums are listed but it says the S rotors cannot be machined.
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Old 03-06-2015, 11:56 AM   #2
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Likely due to the S rotors being drilled units.
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Old 03-06-2015, 12:50 PM   #3
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The S rotors work directional. The venting slots in the middle are designed for the left and the right side. Also the the drilled holes coresspond with the venting slots in the middle. So you need a rotor for the left and for the right side.

Brake disk


Front left


Front right


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Old 03-06-2015, 03:51 PM   #4
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Quote:
Originally Posted by BOOTLEG View Post
Does anybody know why the service manual prohibits machining the BOX S rotors?

The base car rotors can be turned and the minimums are listed but it says the S rotors cannot be machined.
In general because of the holes. Has it been done yes...

Does damage to the brake machining bit and because it skips across the holes, yes you can bevel each hole to minimise damage to the bit. thats a lot of holes....
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Old 03-06-2015, 08:49 PM   #5
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Quote:
Originally Posted by Smallblock454 View Post
The S rotors work directional. The venting slots in the middle are designed for the left and the right side. Also the the drilled holes coresspond with the venting slots in the middle. So you need a rotor for the left and for the right side.

Brake disk


Regards from germany
Markus
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Last edited by Porsche9; 03-06-2015 at 08:54 PM.
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Old 03-07-2015, 05:35 PM   #6
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I've machined them without issue. Just have to slow the machine down a bit.
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