eraticc

Can anyone here give me any advice as to the possible reasons this (see attached image) could have happened? I was out with my S12 cycling the following: http://www.cheaperthandirt.com/product/3-0315782 Gas setting was on #1

Just a quick question for the guys here on the forum. From a Newbie perspective, is there a difference in performance with SGM Brakes or are the differences purely aesthetic?