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2017 BRZ Performance Pack (basically same as SportTech RS) here. I noticed this same behavior with my Brembo's as well. Same circumstances too. Drive 10+ minutes without using the brakes and they seem to go away, then return after you've used them.
I've found it only to be an issue in the cold however. Any snow/rain under 30 degrees and it would occur...not every time, but often enough. It hasn't returned since it warmed up around here though, even when it rains.
I would describe it almost as if the brake booster stopped working. Like I had to really hammer down on the pedal to get it to slow down. Kind of scary when you're getting off the highway and suddenly your brakes aren't there.
Is it possible the discs ice up? Maybe the brake fluid isn't great in the cold? I'm not sure why it does it. But I've kind of stopped worrying about it since it warmed up. I'll be following what you find
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