Two wheel alignment is quickly becoming obsolete and four wheel alignment is rapidly being incorporated on many of the new models. With the technology being incorporated in the newer vehicles, it's not just the front tires which steer the vehicle. Some manufacturers now use four wheel steering and complex electronic suspensions. Specific procedures must be followed to ensure proper wheel alignment. With today's computerized vehicle systems, improperly aligned wheels can effect engine performance, ride, tire wear, steering and premature component failure.
Wheel alignment is the proper adjustment of ALL the interrelated suspension angles.
Camber is adjusted to prevent excessive tire wear and to enhance straight ahead stability. It is measured in degrees and has several methods of adjustment. This is the most critical tire wearing angle. The angle formed by a horizontal line through the plane of one wheel versus a centerline is called the individual toe. Caster is measured in degrees, from the steering axis to vertical, as viewed from the side.