I WENT TO GO STEP ON BRAKES TO SLOW DOWN AS I WAS COMING UP ON A VEHICLE THAT WAS STOPPED DUE TO TRAFFIC IN FRONT OF ME WHEN MY BRAKES LOCKED UP AND I SLID RIGHT INTO THE GUY. I TRIED TO TURN MY WHEEL TO GO ON SHOULDER, BUT VEHICLE WOULD NOT MOVE. I WAS ON THE FREEWAY AND IN TRAFFIC. I WASN'T SPEEDING AS THERE WAS NO POSSIBLE WAY TO AS TRAFFIC WAS IN PLAY, BUT OUR LANE STARTED TO MOVE AND I STAYED BACK AND WHEN I WENT TO STEP ON BRAKES, THEY LOCKED UP.