It could depending on how long the fluid had been in the system and if you didn't use Castrol GTLMA as the replacement fluid. Girling seals have more rubber content in them than components from other brake companies and seem to dislike anything but Castrol brake fluid. -- Mike -------------- Original message from "Steve" <p2freak@xxxxxxxxx>: -------------- > Just wondering. > > Why would flushing the system with new brake fluid cause master cylinder to > fail? > > > > Steve > VIN#04421 > [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/