Originally Posted by senor honda

Excess run-out causes wobble or pounding. In the middle of the pad
wear area, if it exceeds .004 inches, replace or refinish the disc.
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To check Disc parallelism, measure disc thickness with a micrometer in 8 different equally spaced places.........about 45 degrees apart. If measurements vary by more than .0006 inches, replace them
............not that much more costly than machining them down.-Bob