I WAS DISENGAGING CRUISE CONTROL WHICH WAS SET AT 62 MPH TO DEACCELERATE ON A DECLINE TO MANEUVER CURVES IN ROAD. I APPLIED BRAKES AND THEY DID NOT RESPOND. CAR ACTUALLY STARTED TO ACCELERATE RESULTING IN A CRASH AGAINST A GUARD RAIL. AIR BAGS FAILED TO DEPLOY AND RESULTED IN TWO INJURIES ALTHOUGH NOT SEVERE