Caliper pins totally stuck

Hi everyone,

I'm new here but I was hoping some of you more experienced Versa-owners could help me with an issue I'm having.

I'm trying to replace my brake pads. I bought everything (OE Spec pads, brake cleaner, caliper lube) at the local parts store last week, then when this past weekend came around I was all set to go. I took off my left tire, then got my socket wrench out and tried to loosen up the bottom caliper pin. The thing didn't budge AT ALL, no matter how much I tried.

Now the area is a bit corroded, so I figured a bit of PB Blaster would do the trick. Over the course of an hour I applied it four times. Even after doing that the thing didn't budge.

Has anyone else run into this issue? Does anyone know what else I could do, or any other ideas?

Thanks very much in advance.