Weird brake pedal behavior after cold start

[Five_OhGT]

Hello,

I have been having this issue for a few months now, and wondering if anyone has experienced the same thing.

Whenever I start my car up after a while and start to brake (usually at the first stop sign in my neighborhood), the pedal/brakes have this weird behavior where there's a second "step" in the pedal before I'm getting proper brake response. If I'm braking at the normal pedal depression, I will need to push it down another half inch or, and then I can feel what seems to be the calipers engaging properly. It doesn't click, but that's the closest thing I can describe the behavior as. It only does this once, and then the braking will be normal the rest of the drive. It will only do it again if I go a few hours without driving the car.

It's a 2018 GT non-PP, stock brakes. 33k miles on it. No active recalls for my VIN.

Sorry if this has been asked before, but I barely know how to describe the issue, let alone search for it.

Thanks in advance for any help/suggestions.

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[Roadsign]

Could be pad knock-back. There's an article on nasaspeed

(https://nasaspeed.news/tech/brakes/pad-knock-back-what-it-is-how-it-happens-and-what-to-do-about-it/)

and although the focus is on track related issues the fundamentals apply.

 

[Keeffa]

When was the last time your brakes were bled, and I mean like a full flush of the whole system.
Opening up all calipers and flushing it through.

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