I WAS TRAVELING AT APPROX 50 MPH WITH 4-5 CAR LENGTHS BETWEEN THE VEHICLE IN FRONT OF ME. THE VEHICLE IN FRONT ON ME HIT HIS BRAKES AT WHICH TIME I HIT MY BRAKES. MY BRAKES DID NOT RESPOND WHEN I HIT THEM SO I RELEASED THE BRAKE PEDDLE AND HIT THE BRAKES AGAIN. WHEN I MADE IMPACT WITH THE VEHICLE IN FRONT OF ME I WAS STILL TRAVELING AT APPROX 35-40 MPH.