What would indicate the need to replace a sealed wheel bearing?

Excessive noise or roughness in a wheel bearing is a strong indicator that it may need replacement. Sealed wheel bearings are designed to be maintenance-free and provide smooth operation. When they start to fail, they can produce unusual sounds, such as grinding, humming, or clicking noises, which indicate that the internal components are wearing out or damaged. Additionally, roughness during a wheel spin, which can be felt through the vehicle or when rotating the wheel by hand, signifies that the bearing is no longer functioning properly. Addressing these symptoms promptly is crucial, as a failing wheel bearing can lead to further damage, including potential wheel detachment and compromised vehicle safety.

Leaking oil, while concerning, is not directly indicative of a failing sealed wheel bearing since these bearings are typically sealed and do not require lubrication from outside sources. Frequent tire rotation and low tire pressure are related to tire maintenance and handling, and while they can affect overall vehicle performance, they do not hint specifically at the condition of the wheel bearings.