Post by
Q45tech »
https://forums.nicoclub.com/q45tech-u112.html
Wed Feb 09, 2005 3:48 am
Failure to clean inside wheels and hubs with a soft disk grinder is common ----polish to a sparking sheen.........corrosion on wheels inhibits the heat flow and cooling path.
Most runout problems are hub related on quality rotors. I have had some success grining the hub high spots flater.
The less runout you start with, the longer the rotors will stay true before the 6,000-12,000 mile feelable [to the sensitive] warp.