Should car bearings be replaced one at a time or in pairs?

[VanRachel]

Generally, when one car bearing fails, there's no need to replace both simultaneously. Here are specific details about car bearings: 1. Causes of damage: Bearings typically fail due to internal wear or insufficient lubrication. The exact fault point can be identified through a test drive. 2. Replacement cycle: If the bearing lubricant remains intact, bearings don't require periodic replacement within their lifespan and can be used indefinitely. 3. Usage of bearing lubricant: Lost lubricant should be replenished; axle head bearings require minimal lubricant—just enough to coat the rolling space. Excessive lubricant may leak and contaminate the wheel hub or even the brake disc, potentially causing brake failure.