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The brushes probably become concave after wear while rubbing on the commutator of the armature. Maybe there is a buildup of dust or maybe ther commutator needs to be cleaned for better contact with the brushes. I don't think flat is the answer. If you have to replace the motor, look around because it is/was probably used on other items much less specialized other than a treadmill.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 08-03-2011 at 12:32 PM..
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