Even though you have just put new parts on test like you where just starting to check out a brake malfunction. If you can locate the side with the suspect caliper try pushing the pads back. If no go loosen the bleeder as its new and moves easy. See if it caliper will retract then. If it were both sides the master cylinder would be suspect. Only one side rules that out. Also be careful reaching a decision. As even a new hose for example could be faulty. Not likely but possible.