Stuck caliper frame mounting bolts, how do we get them out of there?

Front or rear caliper? 18mm, yep, those can be tight. I might want to try a torch to heat up the bolt which will help loosen the lock tight the factory installs.

Here is a video of the front and rear caliper mounting bracket being removed:

https://youtu.be/9pwFodKAl5A?si=29HUkYpe7R_FWO5C

and

https://youtu.be/EMxfb9X3ywE?si=BwV7CPk84_h3BTtT

A long breaker bar with a good quality 6-point socket is your best bet. Check out the images (below). Please upload pictures or videos in your response to the problem so we can see what's going on.

This is the rear caliper. As you can see the caliper piston was stuck and was driven all the while the inside pad was grinding away. Young driver that didn’t realize what was going on. As near as I can tell, either the bolt is rusted some and won’t budge or it is the factory original and has never been removed even though the truck is 18 years old. The breaker bar wouldn’t move it even with a cheater bar added. I haven’t tried heat yet, but I have tried tapping on the mount with a rubber mallet trying to see if I can loosen something up.

Yep, that needs new brakes all right, did not over sell this repair job. :) I would try heat, it works very well. Good socket and a breaker bar when hot. Let me know, thanks for the image.

anything?