A vehicle consistently pulls to the left; which adjustment is most likely responsible?

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Multiple Choice

A vehicle consistently pulls to the left; which adjustment is most likely responsible?

When a car pulls to one side while going straight, uneven steering geometry between the left and right sides is usually the culprit. Caster is the angle of the steering axis when viewed from the side, and it provides a self-centering force that helps the vehicle track straight. If one side has less positive caster than the other, that wheel lacks enough self-centering torque and the car will tend to drift toward the side with the smaller or less positive caster. So unevenly adjusted caster makes the vehicle pull to the left, making it the most likely adjustment at fault. Worn wheel bearings, steering column misalignment, or toe differences can cause other symptoms, but they don’t produce the same consistent straight-line pull caused by unequal caster.

When a car pulls to one side while going straight, uneven steering geometry between the left and right sides is usually the culprit. Caster is the angle of the steering axis when viewed from the side, and it provides a self-centering force that helps the vehicle track straight. If one side has less positive caster than the other, that wheel lacks enough self-centering torque and the car will tend to drift toward the side with the smaller or less positive caster. So unevenly adjusted caster makes the vehicle pull to the left, making it the most likely adjustment at fault. Worn wheel bearings, steering column misalignment, or toe differences can cause other symptoms, but they don’t produce the same consistent straight-line pull caused by unequal caster.

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