GMC Repair: 2001 Sierra rear brakes, rear brake caliper, rear brakes

Question
Am having trouble getting the rear brake caliper bolts off the truck.  they turn but do not screw out.

Secondly, how do you get to parking brake pads?

Answer
Due to possible liability problems should you INCORRECTLY perform a specific procedure that I tell you to do and as a result of your error and accident should occur due to non-functioning brakes, I do NOT give out any information on brakes.

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