What happens is this; the insides of the master cylinder corrode, especially at the extreme end where you usually do not push the seals. When you bleed the system you force the seals into that corroded area and tear up the seals. The moral of this is that if you do not flush the brake system (and the clutch on the manuals) every 2 years, or you find a car that has been sitting for a long time, figure on just doing the whole brake (and clutch) systems. Brake fluid has the charactoristic of absorbiing moisture from the air. If you do not heat it up by using the car or change it once in a while, it turns corrosive to the internal metal parts of the system. What can anyone expect from 25 year old car parts? David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "Steve" <p2freak@...> wrote: > > Just wondering. > > Why would flushing the system with new brake fluid cause master cylinder to fail? > > > > Steve > VIN#04421 [Long quote trimmed by moderator] 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/