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Old 01-11-2013, 05:22 AM
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Hogie Hogie is offline
It's 5 O'clock Somwhere
Location: Liv'n where I am
 
Join Date: Dec 2006
Posts: 572
Mein Auto: 330i, Z3 2.8L, 545i
OK I called my local BMW parts department and they were nice enough to pull a rotor from stock and take a look. The area that I mentioned in my last post turn out to be rivets.

While I have seen aftermarket with rivets on the horizontal plane to the rotor surface, these are on the hub, which is vertical plane to the rotor. I thought maybe part of a sensing circuit for rotation etc..

The BMW parts person stated that the BMW stock rotor has a aluminum hub riveted to a cast rotor and that is what they are.

This means the Centric are 100% cast and require no rivets. I am going to do the brakes Sat. so I will give some feedback.
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