ABS Light On

[Boilerfan93]

93 4x4 LTD - I replaced my front brakes and rotors last fall and immediately afterwards the ABS light came on and the 4x4 does not work. Is this related to a speed sensor in the front. I replaced the speed sensor on the rear differential. This did not fix the problem.

 

[ricco750]

Same thing happened to me after I replaced front calipers, pads, and rotors this year. I figured air had gotten into the ABS Hydraulic Control Unit...and even though I had done a pressure bleed/flush of the entire system, my Haynes manual told me that the HCU could only be bled with a special Ford tool. I took it to Ford, had them bleed the HCU ($75), problem solved.

 

[Boilerfan93]

I didn't mess with the calipers or the brake lines, so I don't think I could have air in the line. Is it possible that I could have installed the wrong rotors? I noticed there are difference rotors for Rear ABS systems and 4 wheel ABS systems and thought this could possibly be the problem.