One problem related to brake abs warning light has been reported for the 1998 Subaru Outback. The most recently reported issues are listed below.
I was approaching a stop sign in second gear and preparing to stop when the abs apparently took control of my car. I was unable to stop before the intersection and nearly hit another car. I did not feel that the road conditions warrented the abs response (the road was slightly wet) and I did feel that I was in control of my car before the abs took over. I was traveling under 10 miles per hour. I have driven my car in considerably worse weather and was always able to anticipate my stopping distance. The abs light has never come on and when I took my car to the dealer, they could find nothing wrong. Info that may be relevent. . . I was recently involved in a minor car accident but I do not think it should've affected the brakes. I also had my car realigned today and I do not know if this could have any affect on the abs.