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I know you've only mentioned the brakes being replaced and no maintenance to the hubs or bearings. However, just for narrowing down the issue and making sure the light is on the actual culprit. Use a pry bar in the vents of the rotor tod force the caliper to move on the slides. Do not push the brake pedal. Now remove the caliper and attempt to rotate the rotor. If this is difficult you may have to much preload on the hub bearings or bad bearings. If the hubs move without the caliper and with slight resistance(preload) the I'd investigate the rubber lines. It is common for them to corrode internally and allow pressure to the caliper due to applied force but without any counter acting force the pressure will not bleed off. I had this problem on a '69 panel and it was a pain to diagnose because the lines were fairly new and we always doubt new parts are bad.