2002 Nissan Maxima how can I change rear pads

The answer given was correct, but the instruction on turning the piston clock wise is not as simple as indicated. You need a special tool (for the average homeowner, check out Harbor Tools for a brake caliper repair toolkit, about $50). You need a tool that will allow you to do this). Without this tool, it is almost impossible to push the piston back into the caliper housing, and if you don't get it back in, fitting the caliper will not be possible as the new pad will prevent the caliper from being able to go back in.