Got lucky on that one. Dry slider pins are cheap to fix but they are not always the whole story. A squeal can also come from worn pads that have a wear tab scraping, a warped rotor, or even a wheel bearing starting to go. And sometimes the noise comes back a week later because the pin is pitted or the boot is torn, so the grease is only a band aid. Acting like everyone can skip the brake shop and just lube it up is how people end up with a caliper that locks up on the highway. Get it checked if the sound keeps coming back.

Diagnosing before buying parts saves money in every hobby, not just cars.

Wait, banks actually punish you for that? My old bank charged me a fee every month my checking dipped below $800, so I just kept throwing money in there for years like an idiot lol.