How to judge the wheel in SKF bearing if there is a noise

When the vehicle four wheel SKF bearing damage, one of the cars on the road in the car you will hear a continuous om - Om - A humming sound. Even feel the car is full of the sound, and the faster the speed of sound. General speed from around 60 km/h when beginning to hear the hum of the minor, at speeds of up to 70, 80 km/h when feel apparent, 100 km/h when the car talk to raise his voice, the vibration of the soles of the feet have a close at this time. Believe that the above situation is no stranger to the friend that have a car, but this kind of voice that come from? The noise was coming from the SKF bearing the wheels of the car. When I first met also don't know what is going on. So, how to judge whether the wheel SKF bearing noise? When you hear the buzzing noise in the process of driving without panic, must keep calm to continue to drive. Can usually the following several methods to noise to determine noise source: the easiest way is to open the window if listen to the voice came from outside; After the speed ( Hum is larger) Put stall in space vehicles glide, observe whether the noise from the engine, if hum no change when the neutral taxiing problems that might be SKF bearing wheel; Check the temperature of the shaft is normal. The method is: use hands to touch the four wheels, general feeling about their temperature is uniform, Brake shoe, normal clearance, the temperature of the front and rear wheels is a gap, the front wheel to high) , if feel difference may continue to slow traffic to the pit; Lift the car rises ( Loosen the hand brake, idling) before Rises, jack can also be used by the wheel, quick turn four wheels, respectively, when there are problems of axle, it make a sound, like nothing else axle, using this method can easily distinguish which axle is have a problem. Have parts directly to change to troubleshoot.