I experienced the same problem that Joe did, under the same conditions. I was driving to Carlisle on a very hot day when we were directed to exit the PA Turnpike due to an accident between interchanges. Traffic was backed up and just barely creeping along. As I exited on the ramp, I discovered that I had no brakes. I was able to pull the car off to the side of the ramp. Since all of the brakes had just been completely rebuilt, I was puzzled as to what had caused the problem. I used the emergency brake to get stopped. After thinking about the situation, I concluded that the brake fluid had boiled and, therefore, wasn't operating. I could not touch the master cylinder without using gloves. I decided to wait about a half hour for the engine to cool and then had some brake. I then pulled off the ramp and stopped at a restaurant for lunch and to let the engine cool even more. After lunch everything was okay and I finished the trip without incident. When I reached home, after the show, I rebuilt the master cylinder, blew out the brake lines, and replaced the brake fluid with synthetic brake fluid. I've had no problems since, although I have found myself in the same weather conditions. My car does tend to overheat easily when it is very hot and I have to drive slowly or stop in a lineup. I then have trouble with the radiator overheating but I have never had another problem with the brakes under those conditions. Hope this helps. Jim Eckert [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/