Hispec Caliper Wear

Was the car retrofit with larger diameter rotor disc?  I had similar problem with my Porsche race car a while back, due to improper caliper attachment - meaning the caliper studs were slightly too small allowing slop in the mounting hole of caliper itself thus allowing caliper to actually mover around some.  Plus, the caliper mounting required shims to get proper cold disc clearance because the disc grow radially quite a bit when heated.

Hi Dan,

The old rotors I pulled off are the same diameter as the new ones I purchased (from Spring Mountain). I assume they are OE but not entirely sure. OD of the rotor measures 10.25”

The old rotors don’t have any polishing on the outer radius edge (and I can still see the factory stamping), so not sure this is the root cause. That being said the tops of the pads that are in contact with that cross bar are also fairly pristine, so I’m not sure what could be causing it. Unless a previous owner ran larger rotors or something. 

Im debating if I should replace the cross bars or not. I dropped a note to Hispec, not sure if this is a replaceable component or not. 

If they're replaceable, I'd do it.  If I'm seeing the issue correctly it may cause some pad binding at times.  When you let off the brakes the pads need to be able to pull back a little so they don't drag on the rotor.  That might not occur if they're caught on the rough surface.  

I know from experience that it doesn't take much for the pads to stick and to create drag on the rotors and that can cost you a few horsepower.  That might be a minor issue, but it would also be possible for the pad to get caught when you applied the brakes and even if it was only for a second would make things a lot more exciting. If it was for a longer duration things could be much worse. 

The one caliper doesn't look that bad, but brakes are one area I don't take chances on.  I normally replace anything that is questionable.  

Just my .02 cents for what it's worth.