After pondering the problem for a couple of days,Best Guess.The rod that pushes the piston in the master cyl is adjusted too long.About 1 or 1& 1/2 tunes I would think.This causes the breaks to drag And build heat The hard pedal is the clue. Had it happen on a 36 Ford (converted to Hydrouc) First trip out of the shop ( San Ffan to Sac ) The breaks would come on and stop the little Flat Head . Pulled in to every Gas Station along the way and cooled the master with water and made Adjustment .Had to Get to Work by Morning ,or face the Brig (Air Force) .Someone reported me to the Hwy Patrol because of the Strange Behavor.They threatened to impound the car ( I had converted it from A hard top to the street and there were issues) The next day after work one more turn solved the problem. But I learned how to talk to Cops .They even helped me push start it to get me on my way. About year 1957. Jim McMullan 300 F It wasn't a 300 but brakes is brakes. macthehammer@xxxxxxxxxxxxx Why Wait? Move to EarthLink. [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/