Sounds like a stuck caliper to me - though at such a low mileage/age, that's surprising.
An easy way to tell is with a thermometer (one of the point and shoot IR ones would be perfect) after a drive. If the caliper is stuck, that rotor should be significantly hotter. Like...a couple hundred degrees more.
An easy way to tell is with a thermometer (one of the point and shoot IR ones would be perfect) after a drive. If the caliper is stuck, that rotor should be significantly hotter. Like...a couple hundred degrees more.