rear anti lock brakes on 1990 Ford Bronco

My rear anti-lock brake light stays on after i have changed the sensor several times. what can be the problem?

Asked by for the 1990 Ford Bronco
quick fix! remove the bulb. takes about 15 to20 minutes
2 more answers
Low fluid will cause mine to come on
I have a similar problenm in my Dodge Ram and even had the rear end rebuilt. ABS light would drive me crazy on & off. FINALLY, i determined the cause is the MASTER cylinder on the front reservoir. Stuck plunger. Change the Master Cylinder with a HIGH qualty one. This Made in China stuff Kills people or drives them KRAZY. Buy AMERICAN!!!