The 458 has a stud protruding from the hub/rotor. See photo. It appears to be an alignment pin, but the rim doesn't have a single corresponding hole. It is in the opposite position to be a counter weight for the valve stem/pressure sensor. It appears to serve no purpose. Image Unavailable, Please Login Image Unavailable, Please Login
There two bolts that hold on the rotor. One bolt has a conventional hex head. The other bolt has this protruding pin. Ferrari could have used two hex head bolts but they choose to make one bolt with an alignment pin ? Image Unavailable, Please Login
To be technically correct, Brembo is the one who designed the brake system. I would venture to guess that there is a specific reason Brembo did this. Could be used during production of the rotor assembly that has nothing to do with the system when it is assembled to the car.
I'm guessing you are correct there. Perhaps it's to allow spinning the assembly during balancing? Ray
It's not just 458s....360's have them too. I don't believe it has anything to do with balance since when I put the centerlock adapters on, both the hex head and "locating" pin have to be removed It's officially called a brake disc fixing screw at a whopping .44 cents, right next to a screw that costs .16 cents....
