Anti lock Brakes pedal shutters when applied. Abs sensor replaced.

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Can be 5 times a day or once. Brake goes in antilock mode on dry pavement. Could even be in the middle of braking . No noises, no grinding just pulsating. Took to mechanic 3 times, ran car with computer hook up. Light does not come on. Sensor was cracked and it was replaced. How safe is it to drive if no one can find anything wrong?