Trouble phenomenon: When one of the four wheel bearings of the vehicle is damaged, you will hear a continuous buzzing-buzzing-buzzing sound in the car while the car is driving. A slight buzzing sound can be heard at about 60km/h, and it is obvious at 70 and 80km/h. When talking in the car at 100km/h, the voice should be raised. At this time, there is a fine vibration on the soles of the feet.

2. After increasing the vehicle speed (when the hum is loud), set the gear position to neutral and let the vehicle coast, and observe whether the noise comes from the engine. If the hum does not change when coasting in neutral, it is mostly because of a wheel bearing problem;

3. Stop temporarily, get out of the car and check whether the temperature of the wheel axle is normal. The method is: touch the four wheel hubs with your hands, and roughly feel whether their temperatures are the same (when the brake shoe and disc gap is normal, the temperature of the front and rear wheels is correct. If there is a gap, the front wheel should be higher), if you feel that the difference is not big, you can continue to drive slowly to the maintenance station;