I’ve had my 06 RT AWD Magnum for about 10 years now. I’ve replaced one frozen caliper and just did rear brakes and both sides had a one slide that was extremely tight. I was able to clean it up and they are sliding smooth. However, as I assume you dont know who did that last brake job, inspect all four brakes. Check for seized or hard to move calipers, see if one set of pads is worn more the than other. Hopefully you figured it out and can share what you found