What is a common symptom of a worn throw-out bearing?

A common symptom of a worn throw-out bearing is difficulty in shifting gears. The throw-out bearing, also known as the release bearing, has the critical role of disengaging the clutch when the pedal is pressed. When this component wears out, it can cause improper engagement or disengagement of the clutch, leading to issues such as grinding noises, difficulty in shifting, or a feeling of resistance when attempting to change gears.

In contrast, improved acceleration and quiet operation are generally not associated with a worn throw-out bearing, as the symptoms typically involve noise and shifting problems instead. Increased fuel efficiency would also not be a result of a worn throw-out bearing, as such a condition does not directly affect the vehicle's fuel consumption in a positive way. Thus, the presence of difficulty in shifting gears is the most indicative sign of this issue.