Here's a good photo of a cracked Rotor, it was a front and we were still using the old hat which didn't force enough air thru the vanes of the rotor.... and yes it will happen again if we don't change the rotor Hat to prevent air from coming out of the center of the rotor and not making it go thru the vanes in the rotor.
attachment.php Here's the new hat on the rotors to prevent the air from getting out of the center of the rotor.
Now look at the Brakes and see how the temperatures came in from the race track, remember, the temps painted on brakes are, 1200*/1100*/1000*/900* Front brakes should be about 200*degrees hotter that the rear, If the rears are a lot lower then the front brakes, then add more balance bar or use the proportion valve and allow more pressure to the rear brakes,
a. Sand and paint them again for the next session.
b. Bleed them again if necessary.
