An alignment assures your tires meet the road at the proper angle, your wheels are pointing straight and your tires are centered in the wheel wells. It adjusts angles of your vehicle's wheels to original specifications for best gas mileage, proper road contact, a smooth ride and longest tire life.
Torque steer is a pull that happens during acceleration, from a difference in power being delivered to the wheels. A pull only during braking is probably from a caliper on one side sticking and not fully disengaging from the brake disc. A failing tire and improper tire rotation are two more causes of steering wheel pull.