Sometime the obvious is overlooked. It can be a misplaced line very near the exhaust. Is there an exhaust leak? could be an exhaust leak blowing on the cylinder. Ray Ray Jones, Mena, AR in the Ouachita Mountains in western Arkansas Y'all com'on down and we'll sit ona porch and sip a few. On Jul 11, 2005, at 5:08 PM, John J. Hertog wrote: > For the second time, Joe Luciano has lost his brakes - entirely - > while driving his '62 300 convertible. This is getting both very > annoying and very dangerous. Can anyone help Joe ? I personally have > never encountered the exact problem that he is experiencing, but > perhaps one or more of you have? > > The car is a '62 300 Sport convertible; it is using the original > single-reservoir mater cylinder. Up front, the brakes have been > changed to 1964/1964 Bendix-type drum brakes from a 64 300 (that > should not matter) . Other than that, everything is stock. > > First time Joe lost his brakes, he was driving in heavy traffic on a > hot day, coming back from a show. When he called me and described > what happened (pedal first got hard, then disappeared entirely, went > right to the floor) , I (wrongly) assumed it was a bad master cylinder > and told him to change it. Which he did. > > Second time: same scenario, with the new master. After driving the > car for a few hundred miles, from NYC to Carlisle PA and back, with > no problems, Joe once again hit traffic, on a hot afternoon. After > crawling along for awhile, the pedal started to feel "funny" and > then, boom, no more brakes at all. > > This time, however, Joe opened the hood, and noticed that the master > cylinder "looked" hot. So he threw some water on it, and the water > sizzled off the master cylinder like it was an exhaust manifold. And > again and again, just kept sizzling. > > So - I now assume (?) that the master cylinder is getting so hot that > the brake fluid starts to boil, and that is what is causing brake > failure. However - what I don't understand is, why is the master > getting so hot? I mean, it's hot under the hood, but not THAT hot, > and the engine is not overheating, so why is his master cylinder > getting so hot that it percolates the brake fluid? Been driving > these cars for years, never seen that one yet. Anyone else? > > Looking forward to your repsonses, > > John Hertog > Sag Harbor NY > > > > > > > > [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 > > > > YAHOO! GROUPS LINKS > > > â ÂVisit your group "Chrysler300" on the web. >  > â ÂTo unsubscribe from this group, send an email to: > ÂChrysler300-unsubscribe@xxxxxxxxxxxxxxx >  > â ÂYour use of Yahoo! Groups is subject to the Yahoo! Terms of > Service. > > > > [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 Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> 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/