My thermostat stuck a year ago, but I caught it in time it seems. Coolant was boiling out the burp tank and the temp gauge pegged. But after replacing the thermostat it took only about 2 quarts of coolant. A year later the engine runs fine. So maybe you cooked your engine and maybe not--does it run OK? Did you run it for very long in the overheated mode? Just some questions to ask before turning it over to the repair vulturs. Also, replacing rotors and pads is neither difficult nor expensive. If your engine is actually OK, why junk the car??