The ABS has started activating occasionally at low speed. Usually when turning in to a parking lot or other low speed braking situations. Should it not be driven or can I de-activate the ABS until I can get to a dealer?

If you have a '99 - '02 pickup, GM just issued a recall concerning this problem. You can read more here: http://www.automotiveforums.com/vbulletin/showthread.php?t=451261