ABS Warning Light On and/or Erratic ABS Operation on Chevrolet 3500 Pickup

The anti-lock brake system (ABS) front wheel speed sensors are prone to failure. When a sensor fails, the ABS warning light may illuminate and/or the ABS system may activate erratically.

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Average mileage: 109,354 (85,000–140,000)
11 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000
16 people reported this problem
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problem details
1998 Chevrolet 3500 Pickup 102,417 mi,
Just bought truck with antilock brake warning light on. Every now and then it goes out. When it is out, I can feel the antilock brake kick in and there is a pulse from the pedal when pressing the brakes with light stopping.