To find the correct fuse, you must consult your owner's manual. The manual will have a fuse box diagram showing which fuse controls the taillights/stoplights (brake lights). The diagram will indicate the fuse's amperage and location within the fuse box(es). There might be two fuse boxes, one under the hood and another inside the vehicle.
Without the specific year and model of your Chevy Venture, providing a definitive answer is impossible. The fuse layout can vary between model years.