Warren, I just had the same thoughts. Mike Moore 300H On Apr 7, 2012, at 4:08 PM, Warren Anderson wrote: Joe, Any response will be a guess from any source with the given circumstances. But, - -- - Vibration as you describe (more of a high frequency shudder at greater than road speed frequency than a rump, rump at road speed) is most likely run out or even more likely thickness variation in your front rotors. This can be caused by uneven tighteneing of the front wheel fasteners. If the front hub(s) is warped this can be a factor. This is all very possible until you bring in the fact that this vibration was present before the system conversion. Rear drum brakes can cause uneven braking also. New drums, right off the shelf from any source, must be trued properly before installation. Should be trued as installed on the hub. I would swap tires, front to rear and see what happens with regard to this being a carry over problem. Tire structure is the thought here. Warren Anderson Sedona,AZ [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to http://autos.groups.yahoo.com/group/Chrysler300/join and select the "Leave Group" button For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylangYahoo! 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: Chrysler300-digest@xxxxxxxxxxxxxxx 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/