If you bought your car used, the previous owner may have installed a 2lb. residual valve, which would hold pressure. A sticking front master (the larger one) would do the same. I had to rebuild a Tilton which had 2 yr. old fluid in the system and corroded. Change fluid annually.
Hope this helps.
Jack up the front and with the rotor stuck loosen the hard line into the caliper hose. If it frees up its from the line to the master, if not the problem is the hose or caliper. This may sound silly but check that the carpet or floor mat is not stuck in the slot of the floor the pedal travels in keeping the brakes on.
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