Method and system for measuring a lag

A method for measuring a forward or caster of a wheel of a vehicle, comprising the machine-implemented steps of: Providing a machine vision system (100), an optical imaging device (110, 112) for forming a viewing path with a target (118, 120, 122, 124) which is fixed to the wheel and to the corresponding generating position signals of the wheel, and includes a data processor (300) for receiving and processing the position signals; Determining a caster angle of the wheel using the machine vision system (100) based on a first position signal of the wheel, from the optical imaging device (110, 112) is generated when the wheel is rotated with a first steering angle in a first steering position, and a second position signal generated by the optical imaging device (110, 112) when the wheel is rotated in the other direction by the identical first angle in a second steering position of the wheel; Determining spatial characteristics of a steering axis (14) of the wheel on the basis of the caster angle; ...