AFTER DRIVING FOR 30 MINUTES AT A SPEED OF 55-60 MPH ON THE INTERSTATE, I WAS ON THE OFF RAMP MERGING FROM ONE INTERSTATE TO ANOTHER, WHEN THE CARS AHEAD OF ME STARTING SLOWING DOWN. I APPLIED A SUDDEN PRESSURE TO THE BRAKES TO SLOW DOWN ALSO; HOWEVER, THE BRAKE PEDAL WENT SOFT AND THEN IT SEEMED LIKE THE BRAKES LOCKED, BUT DID NOT SLOW DOWN. THE CAR MADE A SUDDEN JOLT TO THE RIGHT BRINGING ME INTO THE ON COMING TRAFFIC IN THE NEXT LANE. THIS RESULTED IN A COLLISION WITH ANOTHER CAR. RESULTING IN A TOTAL LOSS TO THE COBALT. THE AIR BAGS DID NOT DEPLOY EVENTHOUGH THE FRONT END OF THE CAR WAS DESTROYED. *NM