After you have driven for a while (15-20 min.) at highway speed, compare the heat of the wheels on opposite sides of the car. If one has a stuck or sticking caliper, it will be noticeably hotter. They should be warm (front warmer than rear), but not too hot. When the caliper on the rear of my sedan froze, the wheel felt like I could fry an egg on it.
Have you had your pads replaced or inspected recently? The pads have a wear indicator on the inboard pad that will scrape against the rotor to signal that replacement is needed. If that is the cause, replace them soon so that you do not have to also replace the rotors. I do not believe that you will be able to check for pad wear without removing the wheel. I remove the wheel, then the lower caliper bolt (re-torque at 36 lbs. ft.) and swing the caliper up so that I have access to the pads.
WHM
Have you had your pads replaced or inspected recently? The pads have a wear indicator on the inboard pad that will scrape against the rotor to signal that replacement is needed. If that is the cause, replace them soon so that you do not have to also replace the rotors. I do not believe that you will be able to check for pad wear without removing the wheel. I remove the wheel, then the lower caliper bolt (re-torque at 36 lbs. ft.) and swing the caliper up so that I have access to the pads.
WHM