I WAS TRAVELING AT ABOUT 40 MPH DOWN A MAIN ROAD, WHEN I TRIED TO STOP AT A RED LIGHT. UPON PRESSING THE BRAKE, THE WHOLE BRAKE SYSTEM LOCKED UP, AND THERE WAS RESISTANCE. I SWERVED TO AVOID THE CAR IN FRONT OF ME, AND RAN INTO A MAILBOX ON THE SIDE OF THE ROAD. PRIOR TO THIS, MY CAR EXPERIENCED OVERHEATING AND SMOKE THAT BLOCKED MY VIEW, AND I WAS TOLD THAT I HAD A BLOWN HEAD GASKET. I AM MENTIONING THIS BECAUSE I SEE THAT OTHERS HAD THE SAME ISSUE. GM NEEDS TO FIX THESE PROBLEMS BEFORE SOMEONE GETS SERIOUSLY HURT. *TR