[2003focusowner]

I replaced my rear break drum on the dirvers side and the next day my ABS light came on. It is intermittent once and a while but stays on most of the time now. What could I have possibly disrupted when I put the new drum on?

Where would the ABS sensor might be on the rear wheels?

 

[Entrical]

There is a tone ring on the inside of the drum.

http://www.focusfanatics.com/forum/showthread.php?t=217047