How well a vehicle stays in a lane is the result of a complex equation involving the suspension, steering and tires on all four corners. The customer’s definition of a lead/pull condition is explained by the wheel not being straight when traveling in a straight line. An engineer’s definition of a lead/pull condition is the chassis and tire conditions that require steering input to achieve travel in the desired direction. For a technician, it’s about capturing what the driver is experiencing and diagnosing if the condition meets the mechanical criteria for the complaint. When looking to cure the problem, it could be an issue with stacked tolerances of different components and systems.
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