Joined: Jan 2014
Posts: 2,106
Likes: 1,027
From: The banks of the River Charles
Bikes: 2025 Black Mountain Cycles Mod Zero, 2025 Surly Ogre, 2022 Salsa Beargrease, 2020 Seven Evergreen, 2019 Honey Allroads Ti, 2018 Seven Redsky XX
I’m thinking some grease or oil may have contaminated the pads and rotor. When it happened to me my rotor overheated and looked just like that. I’d clean the rotor, whole caliper and pads with isopropyl alcohol then sand the pads. Since it’s the second set of pads they may not be too heavily contaminated.