Problem with ABS / Brakes

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Intermittent ABS light. Was told the axle leaking and had damaged rear wheel sensor. Ordered parts. While waiting for parts, experienced ABS activation at very slow speed while stopping. Never had this before taking it to dealer to get diagnosed! Rear wheel speed sensor replaced by dealer. Again experienced ABS activation at slow speed. Diagnosed this time as left front wheel speed sensor. Part ordered and replaced. Again had the ABS activation at slow speed. Was told it was the deceleration switch. Part was ordered and replaced. Still have ABS activation at slow speed. Help!