MY VEHICLE RAN HEAD-ON INTO THE SIDE OF A CAR THAT RAN A STOP SIGN. MY CAR WAS SO DAMAGED THAT THE INSURANCE ADJUSTOR "TOTALED" IT. THE IMPACT WAS SO SEVERE THAT I, THE DRIVER, SUSTAINED A FRACTURE OF THE STERNUM (I WAS WEARING A SEAT BELT WITH SHOULDER HARNESS). THE AIR BAGS OF MY CAR DID NOT GO OFF, BUT THE AIR BAGS OF THE CAR I HIT DID GO OFF. ON IMPACT THE BRAKE MASTERCYLINDER WITH THE POWER ASSIST UNIT WAS BROKEN OFF THE FIRE WALL BY THE ABS MODULE. THEREFORE I DID NOT HAVE ANY BRAKES AND ROLLED FOR ANOTHER 300 FEET BEFORE COMING TO REST AGAINST A TREE IN THE LOWER SHOULDER OF THE ROAD.