rotor & hat

[Tom Goldman]

Originally Posted by C and W Racing

I would make sure that the caliper is centered on the rotor, if not, it may be causing more load on one side than the other causing the rotor to flex when you apply the brakes.
Chuck

Chuck is correct, this is what causes most rotors to "bell".
When the rotors bell ,or become dish shaped,the bolts ,and the hat are under extrem loading ,that they are not designed for.

Tom