The Broken Fiat Club

I was finishing up replacing my rear wheel bearings today. I had an odd wear pattern on the new slotted discs I had installed several month ago. I checked the caliper pins to be sure that they weren't binding up ( thanks to the member that posted a warning on this ) and they were free. So I set up a dial indicator on the outer face of disc and it ran out .150". So I pulled the disc off and checked the face runout of the new hub. It was .001". So the problem was in the disc. I noticed that the wheel studs had a shoulder on them to limit how far they could be screwed in. The shoulder was the problem. It kept the disc from going on all the way on the hub. If the lathe I ordered had come in I would have set up each stud and cut the outer shoulders on an angle. So the only way to solve the problem was to countersink the stud holes on the discs. After I countersunk the discs I mounted them back on the hubs ,bolted them on, and checked the runout again. Each one was .001". So tomorrow I'm going to pull the front wheels and check the runout of the discs and repair them if needed. I just had alignment done but, now I’ll have to have it rechecked.

Brake performance rotors? Mine seem to have worn pretty evenly, but now I want to go check them again

The disc are the ones I won at Twisted last year. Bryan could tell you the maker , I've long thrown the boxes away.

Also my studs don't look like that (I think). At least visually they are black and not stepped at the end.

I milled the flats on the ends so I could tighten them up with a wrench and not damage the threads.