Pickle Juice? Really? Sometimes I think these guys just say things to throw people off. If you do put pickle juice on the brisket, I think it would have the same effect as mustard... nothing other than a binding agent for the rub. Now, if you inject with pickle juice, I think the results would be a bit more noticeable... and I for one, don't think I would want to notice that! Just saying.
Char-Griller Outlaw w/SFB - "Boss Hog"
Aussie Charcoal Grill - "Piglet"
Cheapie Tabletop Charcoal Grill - "Fire Starter"