98 prelude 115K miles. I just replaced the rear pads first time due to> rusty hand break linkage. The non vented rotor had discolored lines> that ran jagidy perpendicular to the bright wear ring. These I assume> resembled/was due to cracking. I looked on the front vented rotors and> the same thing. I don't know the rotor thickness specifications but> the rotors did not appear to have much wear. i.e. there was just a> slight lip 1/16" or less. I am interested in hearing if any body has> heard of rotors where chunks cracked off.> Are the cracks enough to make replacement of the rotors mandatory?> thanks tom>

You appear to be in Wisconsin. That means you are susceptible to severe > rust, like that shown on this page:> http://www.tegger.c­om/hondafaq/rustybra­kes/brakes2.html>

From your description, it sounds like you've got rust buildup around the > perimeter of the disc, and that rust is flaking off. There's a quick way of > shaving that off.

Cracks that impair the rotor's structural integrity would be visible within > the bright area. If the swept (bright) area of the disc does not show > cracks, then you're fine.>