Delayed Disc Brake Release

Just because the brake hoses are new doesn't mean they're good. If the internal lining of the brake hoses is swelling up it could be slowing the return of fluid to the master cylinder. It could also be an issue with the master cylinder, or the piston seals in the calipers themselves. With disk brake calipers the only thing that retracts the pads is the piston seals themselves, the rest is just knockback from the spinning rotor