Join Date: Nov 2014
Location: Grand Haven, MI
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I have had this issue before, and it is something you will for sure what to address. The bolt/guide pin that is first to the rotation of the brakes (in this case, the bottom bolt) typically have a rubber bushing on the guide pin. Those bushings can swell for whatever reason and lock in place in the caliper. I have actually broken off a guide pin trying to guide them out on a different vehicle. I would do your best to spray a lubricant where the pin enters the caliper, and try turning the bolt/pin back and forth a bunch of times with an impact.
If you don't free this up, your pads will wear unevenly because the caliper can't float like it is supposed to. That is why your inner pad is wearing the way it is. Once assembled, the caliper needs to be able to move freely on both of those pins.
I have honestly just installed my new ones without the rubber bushings. I think it is supposed to help with noise of vibration, but in 30k miles I haven't seen or heard any change. I am in no way saying you should do that, but just mentioning that is what I did with seemingly no issues. I tried to look up what the real use is for it, but didn't come up with much. Also weird that only one pin has it.