First place the brisket into the pressure cooker fat side up. Then, place all ingredients except the carrots into the pressure cooker and cover. Seal the pressure cooker, turn heat to MEDIUM NOT HIGH, and cook on medium pressure for 90 minutes. I get a lot of comments about there not being enough liquid and that the brisket burnt - this is because it CANNOT BE PUT TO HIGH! If you are worried about your heat settings, add another 1/2 cup of liquid to the pot. When you turn off the heat be sure to let the pressure come down naturally, this takes about ten to fifteen minutes. If you have a quick release setting, use this to release the steam faster. Next, place the carrots in, and re-heat the pressure cooker. Cook on medium-high for another 10 minutes. Then, let the pressure cooker cool down again, completely.