SL560 brakes

Recently purchased a sl 560 with documented 27000 mi on it. The car having not been driven much appeared to have a drag when coasting. After driving approx 20 mins. I parked and checked the wheels for excessive heat. Both back wheels were warm but I could hold my hand on them without discomfort. This was not the case for both front wheels. The front wheels were hot to the touch and I could not keep the palm of my hand against them. Question. Do these wheels,for some reason,run hot or is this my cause of feeling a drag coating.