No banging needed if they are just torqued to much. Hopefully you removed the R clip or cotter pin if so just cut the pads off the pin and use a set if vice grips to help you break the bolt torque loose. After that you shouldn't need it unless they are cross threaded. If loose clean any burs off the pin from the vice grip and the spin it out. You would be better off removing the caliper completely and doing it on a bench. Removing any burrs is critical so you do not damage the internal threads.