Ford Mondeo front brakes won't depressurize!

Hi! Did he replaced the caliper and the piston as well? Those should be replace as pair or renewed. As they wear, sometimes unevenly the inner piston moves not concentric with the caliper. When you break the oil pressure push the piston but after they can't retract. The pads stays on the disk. As you carry on, the disk spins and wear the pads. Your break will be hot after short distance and the break pads will wear out quicker or even unevenly, one is wear out the other stays almost new. I had similar problem with my escort 3 years ago. I've removed the break pads, pushed the break until the piston come out almost all away. Used fine sand paper to polish the piston and using a G clamp pushed back the piston. (watch out for the break oil, you may have to remove some) I'm not sure you have the same problem but sound similar. Good luck.