Combine the celery salt, garlic powder and onion powder; rub over brisket. Place in a 5-qt. slow cooker. Combine liquid smoke if desired and hot pepper sauce; pour over brisket. Cover and cook on low for 6-8 hours or until the meat is tender.
Remove roast and cool slightly. Strain cooking juices, reserving 1/2 cup. Shred met with two forks; place in a large saucepan. Add the barbecue sauce and reserved cooking juices; heat through. Serve about 1/3 cup meat mixture on each roll.