This seems to be what was causing hot rear brakes on my knew Big Brake brake install. This is on the inside against the piston where it's hard to see installed. The cross hatch is still visible and the brake pad still has it's original surface. COMMENTS as to why. The rotor does look a little overheated. This is with 500 local miles of use over one month. Notice this race only rotor is already starting to rust after just 2 washes.