Well I was driving my new 89 F2504x4 5.8l c6 today. I noticed going down the road that the rear antiloc light was on. No big deal, our 88 ford f350 dump truck at work has the light on all the time, everything is fine with it. So i wasn't worried. then it went off. Then about 2 minutes later it came back on. then about 3 minutes later, it went back off.... What the hell, is my truck possessed???

 

bump..........

 

check brake switch on master cylinder mine only comes on after using low range ??????? but when mine comes on both rear brake and light in speedometer comes on

 

Start checking your brake pedal feel at frequent intervals. Mine did the same thing, then about 3 days later, I was driving on ice and went to ease onto the brakes and POW! Darn near slammed the pedal through the floor, master cylinder died. As soon as I replaced it(not the reservior, just the metal cylinder) the light went off and has not come back on except for the computer P.O.S.T. when I first turn the key.