Once your pieces are probe tender sit them on the counter for 30-45 minutes to cool a bit. Do not wrap them with anything as you're wanting them to cool. You don't want to put a big piece of hot meat in a residential refrigerator. After almost an hour stick it in the fridge...still unwrapped. Leave it for 3-4 hours at which time wrap it in plastic or foil and tuck it back in the fridge until you're ready to reheat. To reheat place the foil wrapped brisket in a 350 oven and bring the internal temp up to at least 165. If it were me, I'd take it out at exactly 165. You can let it rest if you like for half an hour or so. Then you can slice it. I would not slice it before reheating.
"BBQ...it's just heat & meat" - Circa 5/10/11 - Quote by Cook