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Originally Posted by StraightOuttaCanadaEh
I've noticed my right rear brakes squeak whenever it's raining/snowing and/or cold. I first thought maybe it's the pad wear indicator that started squeaking (is there one on this car?) but the car is only at 50K km (~35K miles) and I feel like the pads should last longer than that. I looked at the rotor and there is a single deep groove that's not present on the other 3 rotors. What could this be? Is it a stone lodged in there?
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That is normal, unless your doing very hard consistent braking your pads are fine. A small amount of rust appears when there is a lot of moisture in the air which can cause a bit of squeaking. You will see once the air dries out and you drive a bit the squeaking will go away. My OEM brake lasted until 80k FYI and over the years it always squeaked a bit after it rains. Also the oem brakes do have a metal bit that is designed to squeal when the pad wears enough.
As for the groove, that is concerning, I would off the pads and inspect it. I'm going to guess the guide pin on the caliper could be gunked up causing abnormal wear on that disc. You can remove the guide pin, clean it up, and add some silicone based grease and re insert it. I think Chris FIx has a great how to video detailing the process.