Yea, it needs a bigger M/C, the disc piston area is much larger. And you do not add fluid to the M/C over time. The pads wear down and the pistons do not come back as far which makes the fluid level drop. The M/C should be dual and match the calipers to work properly. Do not add as when you change pads and push back the piston, the fluid will overflow the M/C which can make a mess. Ray On Jul 20, 2011, at 3:26 PM, Ron Waters wrote: I'm asking because when I converted myi1970 Olds from factory drums (in the front) to factory discs, a larger m/c was specified by the parts book. [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/