You can actually hear it break loose, it's like a metal on metal pop noise. I can feel it breaking loose too, there's a slight resistance but then it pops right away. It almost seems like it's coming from the back right, so I'm not sure if it's the electronic e-brake getting stuck or something like that. I almost thought I hit something the first time it happened.
It's not so much the rust I'm worried about. I know that's normal, but it's almost like the rust is making the pads stick to the rotors, or it's making my e-brake stick, and that I'm not used to.
It's happened twice and both times was after a car wash, and both times I let it sit in the garage over night without going for a drive to get the rotors dry or anything like that. I've never had anything like that happen to me before, but the R has bigger brakes than what I'm used to and an electric e-brake so maybe that has something to do with it.