rdollie
Seasoned Member
- Joined
- Aug 17, 2021
- Messages
- 812
- Location
- USA
- V-Series Cadillac(s)?
- 2017 CTS-V; 2022 CT5-V Blackwing
I have an M3 that sits outside in the rain here in the Seattle suburbs and does the same thing on the infrequent occasion I drive it (about once/month.)
If the stock brake pads are suitable for track day use(which they are, from what I've gathered) then they probably have a higher amount of porous metal within the compound. The dissimilar metals from the iron rotor and the pads themselves cause surface rust which could form a weak bond between the pad and rotor surface with water and moisture present. This will happen with aftermarket metallic and semi-metallic track pads as well. Any 'track ready' car worth its price will have metallic stock pads like these and it is very normal for the pad to stick to the rotor after being parked in the wet and/or humid conditions. My Veloster N(also another track ready car) with stock pads does this. And my previous cars with aftermarket track pads also do this. Completely normal, and is a compromise when buying track ready cars.