Took the car into the shop to get the brakes looked at since 2 of the caliper piston boots were missing and to get some bearing noise looked at.

Warranty gave me 2 brand new calipers/rotors and many new rear end bearings. I apparently got the calipers hot enough to fuse both rear pistons on both fronts. I guess repeated braking from 120mph at the road course tracks will do that.