Driving with emergency brake on

They work on the rear only, separate systems of engagement - but same brake shoes, not an entirely different system - the e-brake uses a cable in case of complete hydraulic failure (Exceedingly rare) and if you didn't smell them 'burning up' or feel a lack of power they are probably fine. If it gives you peace of mind, by all means take it to a dealer or a shop/service center a have them inspected/adjusted The shoes probably took some wear . The front was not affected at all and does 70% of stopping. But the rear may need adjustment. But then again the rear is self-adjusting, every time you apply brakes while backing up. The front are disc .Good Luck