thanks guys .this is what i had suspected, but wanted to be lazy. I know that lazy and safety never go hand in hand.
The rotors were OEMs and i put em on myself 2 years ago. Pretty sure that the stamp on the rotor for minimal thickness was 12.5 mm. But not totally sure.
does anyone know what page or section the rotor install instructions are in the D1 workshop manual pdf? I can't seem to find it in the pdf. I know it is there as I had printed it out last time so that i could have all the torque specs handy. It is not in the brakes section. where the heck is it?
thanks again for the help.