US Patent 7415324 Vehicle wheel alignment adjustment method

A method for measuring and aligning front and rear wheels of a four wheel vehicle, including measuring alignment properties of the front wheels, and correcting alignment properties of the rear wheels if all of the measurements of the alignment properties of the front wheels are substantially equal to the manufacturer-specified alignment properties for the front wheels. If all of the measurements of the alignment properties of the front wheels are not substantially equal to the manufacturer-specified alignment properties for the front wheels, then the alignment properties of the front wheels are corrected prior to correcting alignment properties of the rear wheels. The measurements of the alignment properties can be made using a computer-aided, three-dimensional machine vision alignment apparatus.