The left rear caliper seized and it made sense why it scared the living crap out me when I was on the track. It’s prob been sticky for awhile now. I’ve been commenting how the car drives a bit funny under heavy braking and well, now I know this was the other reason.
In hindsight, having replaced the left rear caliper the right should have also been rep[laced as well.
Luckily, a friend had one on stand by and so I was able to quickly replace it for the next event. This rear caliper is an odd part. The bleed screw is a 11mm head and the ebrake mounting location is set at a slightly different angle. This is a Type R part – we are thinking it’s a UK version.