The Toyota Avalon wheel bearing is a form of lubricating mechanism. It allows smooth movement of a free flowing part. Different vehicles have different forms of wheel bearings. The conventional form of Toyota wheel bearings includes visual ball bearings or tapered roll bearings. Some vehicles house a wheel bearing hub assembly instead of simple bearings. The Toyota Avalon wheel bearing is bolted directly onto the U-joint and also bolted onto the wheel. Warning signs of a imminent wheel bearing include: increased vehicle vibration, howling or even grinding noise, and elevation of operating temperatures.