1999 BMW 5 SERIES User Comment / Complaint

I have a 1999 bmw 528i with intermittent abs controller issue, which activates at low rate of speed. i went to the dealership and they replaced the abs sensor. the next day it activated again. i returned to the dealership, they did a diagnostic and stated the abs repair kit is bad. i asked what is that and they stated it controls the abs system on my car and the part is $1000. i am a member of roadfly.org, which is a network consisting of bmw owners sharing information about issues and tips. my concern is this is a safety issue and its a known problem with the bmw (e39). i would like the manufacturer to check the www.roadfly.org message board on the bmw e39 1997-2001.