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Jack up both rear wheels so they spin free. Remove the tire/wheel assembly and spin the axle. Does it spin free or is there resistance? Apply the brake a few times and see if it spins free. If there is drag, first open the brake bleeder to check for any remaining pressure that didn't release. If it now spins free you have a master cylinder problem. If it still drags remove the caliper and spin it again. If it spins free now the new caliper or the mounting bolt slides are binding. If it still drags remove the rotor and inspect the e brake shoes and the inner drum they ride on. Also apply the e brake and release it to see if the shoes return to rest position. Lastly spin the axle only and feel for any roughness. Should give you an indication of any bearing problems.
Hope this helps as I have been away for 10 years from my auto repair business.
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