The other plug and item going into the hub is the ABS speed sensor. The plugs are different, so no real worries about them being in the wrong spots.
I've heard there is a way you can test the brake wear system by pulling the gauge cluster and testing resistance between certain pin-outs. Maybe someone has their book handy and can give a little better understanding. My brake wear light is on as well, 4 new wear sensors installed. So this'll be something I'll have to do as well.
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