1992 GMC SUBURBAN — SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP

WHEN BRAKES WERE APPLIED VEHICLE SHOT AHEAD AND THEN BEGAN TO STOP. ALL INCIDENCES OF FAILURE SEEMED TO OCCUR WHEN THE REAR WHEELS MOMENTARILY LOST CONTROL WITH PAVEMENT, I., GOING OVER A MANHOLE COVER THAT WAS RECESSED/PAVEMENT DEPRESSIONS AT EXPANSION JOINTS OR HEAVY CONCENTRATIONS OF WATER. IN THE ROADWAY. WHEN VEHICLE ENCOUNTERED ONE OF THESE CONDITIONS UNDER HEAVY BRAKE PRESSURE, THE ABS BRAKES WOU;LD EMIT A LOUD GROANING NOISE, AND VEHICLE WOULD ACCELERATE AHEAD. THEN AFTER ONE OR TWO CAR LENGTHS WOULD GRAB HOLD AND TRY TO STOP. IN ALL OF THESE CASES, THERE WERE NO INJURIES. *AK