A customer experiences a vibration only while braking. Technician A says the wheel lug nuts may be overtorqued. Technician B says a front wheel may be bent. Who is correct?

When a customer experiences a vibration specifically during braking, it indicates that the issue is likely related to the braking system or components directly associated with the wheels. Technician B's assertion about a bent front wheel could potentially lead to vibrations, but it is essential to consider that vibrations occurring specifically during braking are more commonly related to the braking components, such as warped brake rotors.

Technician A's comment regarding overtorqued wheel lug nuts is relevant because excessive torque can lead to warping of the brake rotors. If the lug nuts are overtorqued, it may cause stress on the rotor, leading to uneven surface contact when brakes are applied, ultimately resulting in vibrations. This scenario aligns more closely with the symptoms described by the customer, as the braking action directly interacts with the state of the rotor and pads.

In conclusion, the main issue presented—a vibration when braking—correlates more directly with the effects of overtorque on the lug nuts than with a bent wheel. Therefore, Technician A's reasoning aligns best with the symptoms, making that the correct perspective in this scenario.