Thanks for the pictures Chris (although not all of them came through on your posting). Were these PCCB from your GT2 (is it stock weight?)? If so, are these PCCB from the so-called first version or supposedly improved second version?

It appears from the one picture of the front brakes that the brake pad is destroyed with some wear on the brake rotor. It is unclear from the one photo of the front brake as to whether the pads were working evenly on the rotor. What was the assessment of the situation, i.e. worn pads, damaged rotors or both? What caused the damage, i.e. overheating (if so, how fast were you going and does the GT2 have any brake cooling system?)

It seems from your message that this happened after 250 to 300 km of track use. Is this correct?

What do you mean by CUP-linings, i.e. brake pads from the GT3 Cup Car? If so, it appears strange that you could use a pad from a steel rotor system for the PCCB.