I ask because I have brand new OEM rear rotors, brand new ATE (OEM) calipers, and new Pagid Blacks on the rear of my SC. They were run for a few hours of DE and a club race at the Glen. I alway ran PF97's and the rotor surface was always smooth. My fronts are still PF97 and exhibit no grooving either. I suppose it "could" be buildup (i'll hit it with a 3" scotchbrite pad later) but sure looks like grooves...

 

I didn't find Pagid Blacks to be any more agressive the PF 97's. Maybe less so.

 

When I go down to the shop to play i'll snap a picture before attempting to clean them up... and after if it has any effect.

 

I had big problems with material transfer with Pagid Blaks, so I stopped using them.

 

Gary - Here is picture of my GT3 rear rotors running Pagis RS14s taken after 16 DE events... i would categorize the grooving as "light"...

 

NO

 

I have run both Pagid Yellow and Performance Friction PF97's. They both grove equally to me.

 

Not on my 944... but who the heck uses brakes on a 944 anyway?!

 

Gary, My Pagids do not groove (orange front, black rear). Hawk Blues groove like crazy and were very aggressive on the rotors.

 

Have run Blacks and Oranges w/o issues, in 951's as you know...

 

No problem with blacks on my 996.

 

Here are a couple pictures, definitely grooves..

 

I've run stock, pagid orange, pagid yellow, and pagid black and have noted no difference in the depth of the grooves. Big differences in stopping and dust generation, but not in rotor appearance.

 

Well, as long as they are in the circumferential direction of the rotor, and not across it, I don't think that you have much to be concerned with.

 

I was just curious why the Pagids are eating my rotors in strips vs. the PF97s, which seem to wear flat.. seems like the braking efficiency would be better on a flat surface, no?