The amount of material that can be removed from any given brake drum is specified by the manufacturer's engineers who created them. Thus the amount varies. Don't think I would ever want to risk going beyond the recommendation. I'm thinking it was very late '60s, maybe early '70s that they started showing the maximum cut on the edge of the drums. Always looked like it was cast in rather than stamped to me. Replacement drums for our cars thus also had this. I'm of the school that says equal drum diameters are critical to equal stopping pull from each side. Especially on sensitive Chrysler "Center-Plane" brakes. Probably not as critical on rears but I want them equal on my steering axle. Wayne [Non-text portions of this message have been removed] To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/