Facts: Alignment should be done once a year whether or not you notice an issue. Alignments improve traction, cornering, and braking. Alignments decrease your tire wear. Lastly, believe it or not a proper alignment calibration will help prevent brake pad wear.
Should I have an alignment done even if my car is not pulling or drifting? Yes, experts recommend once a year, especially with lane departure and drive assist features. See video below.
What if my car vibrates? An alignment will not "fix" a vibration concern. Rather the alignment could be out, which caused the tires to wear, ultimately leading to vibration.
Do I need an alignment if my car pulls when I brake? It is suggested to check your alignment, but this will probably not fix the pull when braking. More than likely you have a brake failure at one of the wheels.