As already written, it depends on whether you brake or not. If you drive 100 miles on the freeway and don't brake, the brakes aren't even warm to the touch. If you're driving normally in city traffic, the brakes are warm and if you're driving downhill with a trailer they get hot. If they are so hot, after a normal ride without braking, i.e. country road, or highway, that you can hardly touch them, then something is wrong and especially if one wheel, or two differ significantly from the others in temperature.
As well you can carjack the car and try if the wheel is free turning, when you're in neutral.
So it happened again today left rear locked up on me and wouldn't fully release, rotor is now blackish blue and strong smell of burning brakes. Pulled abs and traction fuses and it doesn't appear to be dragging anymore. So would this be the module or pump or both? Or would a faulty precharge pump do this if it were say stuck on.
Nevermind, on my way home this morning from work I got almost home sitting at a stoplight went to take off and its still sticking. So the only hoses that have not been replaced is the two center ones that I can't for the life of me see how to get to without having a lift.