Easy way to check for a sticking / seized caliper...Just use the back of your hand to feel the temperature at the openings of the wheel. If you have one that is noticeably warmer than the others then it is likely that the caliper is sticking. You can confirm it by lifting that wheel or that side of the vehicle just enough to do a comparison hand spin test of the wheels. You will feel a difference. 99% of the time though the temperature test is good enough. Can obviously be done with a laser thermometer if you have one as well.