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This happens on my 97 every couple years. Caused by too big an air gap between the rear ABS sensors and the exciter ring. To correct, remove rear drums, carfully clean the exciter ring (exciter ring looks like a gear around the spindle)and the abs sensor. Check for cracks on the ring. Visually check the gap between the ring and sensor. turn the ring so the sensor is located between the gears, and from behind the backing plate , bend the sensor bracket so the sensor is just missing the ring when turned. I carefully tap the bracket with a hammer to bend it. Be carefull to just hit the bracket where the retaining bolt is and make sure the sensor tip will not hit the ring when hammered. There is no published clearance that I know of so I just eyeball the clearance to about 1/32" or so.Slowly rotate the ring to be sure the sensor is not hitting the ring. Don't be surprised if you have to do it again in a couple years. I believe a combination of rust on the bracket and heat causes it to slowly return.
Clean and adjust your brakes, reassemble and road test, your problem should be gone.
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