Originally posted by Yoda
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I too have an infrared thermometer and use it frequently, but really just touching the hubs will tell you if there is an issue. As mentioned, you are looking for one wheel that's a lot hotter than the others.
I've noticed that just applying the brakes one time before a stop heats up the drum a lot. If you really want to check the bearings, dial your brake controller down to zero right before you make a rest stop on the highway. You will usually find the drums are cool to the touch.
Jerry
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