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1st check your brake fluid level in your master cylinder. Low fluid level in the brake fluid reservoir will cause both lights to come on. If it was really low you should fill it up and then bleed the brake system. If fluid level is ok, then a failure of a component in your anti lock brake system has occured.

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Q: What would cause the rear anti lock and brake light to stay on in a 1989 bronco 2?
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