I did a new brake setup on my Gen 4 ACR with RB TA size rotors with carbotech xp20 front and XP10 rears.

The brakes felt amazing until they diddnt. Day one was at road america, day 2 was at gingerman. Front pads were done after 3 sessions at gingerman but I noticed some deep groves in the rotors. Never had this happen. Are the rings toast? can they be cut? bad set of rotors? The rotors on my TA still look new and have 4-5 track days on them.

Any help is appreciated.

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