1993 Chevrolet Suburban

DURING ALL KINDS OF WEATHER CONDITIONS THE ABS BRAKING SYSTEM HAS FAILED TO STOP THE VEHICLE, TWICE CAUSING A REAR END ACCIDENT. DURING A HARD BRAKING SITUATION WHEN ON DRY PAVEMENT, OR ANY BRAKING CONDITION ON WET PAVEMENT THE BRAKES HAVE BEEN APPLIED AND THEY GRAB AND THEN RELEASE CAUSING THE VEHICLE TO CONTINUE MOVING FORWARD WITHOUT COMPLETELY STOPPING. THE VEHICLE HAS BEEN TAKEN TO MANY CHEVROLET DEALERSHIPS AND INDEPENDENT SHOPS FOR REPAIR AND BEEN INSPECTED OR REPAIRED WITH COMPLETE BRAKE REBUILDS WITH ABSOLUTELY NO IMPROVEMENT IN STOPPING ABILITIES. THIS MODEL VEHICLE SHOULD ABSOLUTELY HAVE BEEN RECALLED SHORTLY AFTER MANUFACTURE. THERE IS SO MUCH DOCUMENTATION THAT THESE VEHICLES HAVE THIS PROBLEM THAT THIS AGENCY SHOULD BE ASHAMED OF NOT FORCING A RECALL FOR REPAIRS OR COMPLETE REDESIGN OF THE BRAKING SYSTEMS. THE MINOR RECALL AND"FIX" OF THE BRAKE-BOOSTER OUTPUT ROD WERE A JOKE AND NEVER SHOULD HAVE BEEN ALLOWED AS A FIX. THE EXCUSE CHEVROLET USES THAT IT IS A "BRAKE PEDAL FEEL" THAT IS THE PROBLEM IS INEXCUSABLE AND IRRESPONSIBLE. I HAVE BEEN A PROFESSIONAL TRUCK DRIVER (CLASS "A" CDL WITH ALL ENDORSEMENTS) AND MECHANIC AND HAVE DRIVEN SEVERAL OTHER MAKES OF LARGE HEAVY PASSENGER TRUCKS AND SUV'S WITH ABS BRAKING AND NEVER ENCOUNTERED THIS PROBLEM WITH ANY TYPE OF VEHICLE. *TR

MY SUBURBAN HAS DEVELOPED A PECULIAR PROBLEM THAT HAS LEFT EVEN THE DEALERSHIPS COMPLETELY CLUELESS!!! THE ENGINE HEATS UP TO ABOUT 180 F (STILL LESS THAN THE MID POINT ON THE GUAGE) AFTER A COUPLE OF HOURS OF DRIVING -- THIS IS QUITE NORMAL. IF WE STOP AND TURN THE ENGINE OFF, THE VEHICLE WILL NOT START! WE HAVE TO WAIT A COUPLE OF HOURS WHILE THE ENGINE COOLS OFF TO ABOUT 160 F, AND IT STARTS UP JUST FINE. WE ONLY NOTICED THIS SINCE WE WERE ON A LONG CROSS COUNTRY DRIVE. THE PROBLEM IS ENTIRELY PREDICTABLE, AND WE HAD TO PLAN ON TWO HOUR STOPS DURING OUR TRIP. WE EVEN DROVE STRAIGHT TO A DEALERSHIP IN RALEIGH AFTER STRAIGHT 6 HOUR DRIVES SO THAT THEY COULD SEE AND DIAGNOSE THE PROBLEM -- BUT THEY WERE COMPLETELY STUMPED. I WOULD LIKE CHEVROLET TO HELP DIAGNOSE AND FIX THIS PROBLEM. THE ABS MODULE FAILED WITHOUT ANY PRIOR WARNING. ONE MOMENT THE BREAKS WERE FINE, THE NEXT WE WERE FLOORING THE BREAK PEDAL AND THE ABS LIGHT WAS ON. THE MECHANICS HAD TO GO THROUGH SEVERAL ATTEMPTS AT REPLACING THE UNIT ($1200 FOR THE UNIT ITSELF). THIS PROBLEM SOUNDS EXACTLY LIKE THE ISSUE INVESTIGATED IN 1992-1995 SUBURBANS. I AM SURPRISED THAT THE RECALL WAS LIMITED TO THE LIGHTER SUVS ONLY -- A DECISION BASED ON COST (MOST PROBABLY). IT STANDS TO REASON THAT THE PROBLEM WOULD BE MORE CRITICAL IN HEAVIER VEHICLES.

ABS FAILS ON UNEVEN SURFACES, SUCH AS WASHBOARD ROADS AND WHEN HITTING BUMPS DURING BRAKING. ABS PERFORM POORLY IN MOST CONDITIONS, INCLUDING DRY PAVEMENT. THEY DO PROVIDE SOME BENEFIT ON SNOW/ICE. HOWEVER, MY ABS HAS NOW FAILED AND OVERALL BRAKING PERFORMANCE IS BETTER. THIS SYSTEM, AND THE LOGIC IN THE CONTROLLER, NEED SIGNIFICANT CHANGES. *JB