When one of the four wheel hub bearings of the vehicle is damaged, you will hear a continuous buzzing sound in the vehicle during driving. It is unclear where this sound comes from. It feels that the whole compartment is full of this buzzing sound, and the faster the speed is, the louder the sound is. The following is the judgment method:

Method 1: open the window and listen to whether the sound comes from outside the car;   

Method 2: after increasing the speed (when the buzzing sound is large), put the gear in neutral and let the vehicle slide, and observe whether the noise comes from the engine. If the buzzing sound does not change when sliding in neutral, it is mostly due to the problem of wheel bearing;   

Method 3: stop temporarily and get off to check whether the temperature of the wheel axle is normal. The method is: touch the four wheel hubs with your hand to roughly feel whether their temperatures are consistent (when the clearance of brake shoes and pads is normal, there is a difference in the temperature of the front and rear wheels, and the front wheel should be high). If you feel that the difference is small, you can continue to drive slowly to the maintenance station;   

Method 4: lift the car with an elevator (release the handbrake and put it into neutral gear before). When there is no elevator, the wheels can be lifted one by one with a jack, and the four wheels can be rotated quickly by manpower. When a problematic axle is encountered, it will make a sound, which is completely different from other axles. It is easy to distinguish which axle has a problem with this method.   

If there are cracks, pits or ablation on the hub bearing when it is seriously damaged, it must be replaced. Before installing a new bearing, apply lubricating grease first, and then reinstall it in the reverse order. The replaced bearing must rotate flexibly without clutter and vibration.