SERVICE BRAKES, HYDRAULIC:ANTILOCK:CONTROL UNIT/MODULE
PULLED OUT OF PARKING LOT ON TO ROAD. APPLIED BRAKES WHILE APPROACHING A LIGHT. EVEN WITH BOTH FEET ON THE BRAKE PEDAL THE 1996 GMC JIMMY BARELY CAME TO A STOP FROM A DISTANCE OF 6 CAR LENGTHS GOING 30 MPH. NARROWLY AVOIDED REAR-ENDING VEHICLE IN FRONT OF ME. THIS WAS NOT THE FIRST TIME BUT THE CLOSET ENCOUNTER. BEFORE THIS INCIDENT I HAD THE FRONT ROTORS, DISK PADS, CALIPERS, FRONT FLEX LINES, BOOSTER, VACUMM HOSE AND CONNECTOR ON ENGINE TO BOOSTER, MASTER CYL., AND REAR BRAKE LININGS - REPLACED. SINCE THEN I HAD THE VACUMM CHECKED FROM THE ENGINE TO THE BOOSTER AND WAS TOLD THE BOOSTER WAS BAD. I HAD THE BOOSTER AND MASTERC REPLACED AGAIN. STILL NO CHANGE. PEDAL GOES TOO FAR DOWN AND FEELS LIKE IT HITS A BRICK FOLLOWED BY VERY WEAK BREAKING ACTION.*AK