95 yukon abs help

I have a 95 yukon with a 5.7 liter auto (4l60e) the book I have for the abs codes says it has a kelsey hayes series 8 abs unit (5 lines 2 in 3 out) my problem is that the abs activates occasionally wet or dry when coming to a stop . If the abs light is on it doesnt do it but if the light is out it will. I got some trouble codes from the unit (73, 86, 12, 25, 21, 26, 27, 23, & 66) I know its alot and some of them dont make sense in the book. I havent replaced the brakes for almost a year but they are not wore out. I have tried to blow the sensors off with compressed air. I checked the wiring connections and no corrosion and also checked to see if my front wheel bearings are bad(wnich they are not). So where do I go from here? Any help would be greatly appreciated!

Bill:banghead:

Had the same problem recently, however air blowing of the sensors not always help, therefore I have decided to change them to new ones one by one ... To my luck after the second sensor replacement everything became normal : no light no defects in ABS work.
Good luck

Thanks I decided to replace both my front sensors because the codes for both sides come up just as soon as I have the extra dough$$$$$$