EE STATED THAT PRIOR TO STARTING DOWN GRADE INTO MINE, HE TRIED THE BRAKE AND THEY WERE OKAY. HE SHIFTED INTO 1 ST GEAR AND STARTED OVER. THE LOADER JUST TOOK OFF. THE BRAKES WOULD NOT STOP IT AND I CUT IT INTO THE WALL AND JUMPED OUT. EE SUFFERED LACEATION BEHIND RIGHT EAR, STRAIN RIGHT SHOULDER AND RIB CAGE AND FRACTURED VERTEBRAS.