ANTI-LOCKING BRAKES - PROBLEM WITH ABS BRAKES - AS BRAKES APPLIED ON DRY OR WET SURFACE, THE WORST BRAKES GOT, NO MATTER IF LIGHT OR HARD TOUCH OR SLOW OR FAST SPEED. GMC SIERRRA (2001) WAS BROUGHT IN FOR REPAIR AFTER BRAKES FAILED CAUSING SLOW SPEED COLLISION WITH SPOUSES PU TRUCK IN MY DRIVEWAY RESULTING IN NO DAMAGE OR INJURIES. REPLACED ONE SPEED SENSOR (LEFT FRONT WHEEL) AND CLEANED OTHER AT MY EXPENSE ($148.60 FOR PARTS, LABOR CHARGE WAIVED - MILEAGE 35416). 2ND COMPLAINT OR REQUEST - DRAGGING BRAKES OR LOCKING AND PULLING WHEN APPLIED 3RD COMPLAINT OR REQUEST - REMOVE ALL FOUR WHEELS AND CHECK BRAKES - RESULTS - REPAIR INCLUDE PARTS & LABOR AT MY EXPENSE - (MILEAGE 41073) MACHINE TWO FRONT AND TWO REAR ROTORS AND REPLACE FRONT AND REAR CALIPERS PLUS FREE UP SLIDDERS (PARTS $272, UNKNOWN BREAKDOWN ON LABOR COST ABOVE AND BEYOND).