I AM WRITING ABOUT ISSUES WITH THE BRAKE SYSTEMS IN 1998 GMC SIERA EXT. CAB P/U. THE ISSUE AT HAND IS THE DEPLOYMENT OF THE ABS SYSTEM WHILE YOU ARE DRIVING, IT HAS CAUSED NUMEROUS CLOSE CALLS. I SPOKE TO MY MECHANIC TODAY SAID IT WOULD COST WELL OVER $600.00 TO CORRECT ISSUE, AND HE HAS RAN ACROSS THIS ISSUE WITH NUMEROUS GMC PICK UPS. I HAVE ALREADY REPLACED BRAKES AND ROTORS TWICE ON THE FRONT BRAKES, I HAVE MAINTAINED THIS VEHICLE THE WAY I AM SUPPOSED TO MAINTIAN IT. I HAVE ALSO BEEN IN AN ACCIDENT IN MY OWN DRIVEWAY BECAUSE IF THIS ABS PROBLEM.AS I WAS BACKING UP I APLIED BRAKES, AND THE ABS DEPLOYED. I'M JUST GLAD IT WASN'T A CHILD THAT WAS BEHIND ME. IT SEEMS THAT GMC HAS NUMEROUS PROBLEMS WITH THEIR BRAKING SYSTEMS. *AK