Check the back side of the rotor to see if it is rusted. If it is clean then the slider pins are stuck and the caliper can't move. If both sides are rusted then it is a stuck caliper. The slider pins can be taken apart and sanded clean then re-greased to make them slide nice and easy. The caliper is usually harder to get free and most people just replace them.
While you are at it check the back drums and make sure they spin free like a bicycle tire and take a long time to stop.
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