My first attempt at brisket was a couple years ago. I had purchased a fairly cheap charcoal bbq unit and had been learning about direct and indirect heat, how to cook salmon on alder planks, how to use a charcoal chimney, and how to manage heat.
The brisket attempt was abysmal: completely black and charred on the outside and bone-dry inside.
I tried it again yesterday.
I bought a 13 lb. brisket; rubbed it with some hot, spicy, mustard; spread a rub over the entire surface; and once the temp was at 185-200 degrees on the smoker, I put the meat on the grille and closed the lid. For three hours. This temp heats the meat above the threshold temp for danger (140) and produces a most impressive smoke ring once the meat is done.
At the three hour mark, I pushed the temp up to about 375 degrees for one half hour where it develops a "crust;" then lowered the temp to about 275. At this time I also put the meat into a foil pan, poured in almost a quart of Coca-Cola (do not use diet-Coke - the aspartame is converted to formaldehyde at these temps), tented the meat with foil, and let it cook for about 4 more hours. When the meat reached 195-200 degrees, it was declared ready to take off the grille.
Covered with foil for another half hour, it was then cut across the grain and plated. The meat was sliced thin enough for sandwich style preparation on hamburger buns, choice of sauce was left to each individual.
The brisket was excellent, with just a bit of dryness which I am going to research and try to do a little better next time. I think the answer may be to cook it just a bit longer at the top temp.