THE VECHILE WAS COMING UP TO A STOPLIGHT. MY DAUGHTER WAS DRIVING MY 1997 CHEVY BLAZER. SHE PUSHED DOWN ON THE BRAKES AND NOTHING HAPPENED. SHE TRIED AGAIN AND STILL NOTHING. SHE AND MY YOUNGER DAUGHTER CRASHED INTO A SEMITRUCK TRAILER. THE POLICE ESTIMATE HER SPEED AT 28 MPH. THERE ARE NO SKID MARKS. THE BRAKES DID NOT WORK. *AK