ABS BRAKE SYSTEM

I HAVE A 92 MERCURY GRAND MARQUIS-4.6L ENGINE AND HAS 90,000 MILES ON IT.
WHEN BRAKING AT SLOW SPEEDS, UNDER 10MPH
THE BRAKES SEEM TO PUSH BACK. THE ABS LIGHT
DOESN'T COME ON, HOWEVER IF I DISABLE THE
ABS SYSTEM BY DISCONNECTING ONE OF THE
ABS WHEEL SENSORS THE PROBLEM GOES AWAY.

THANKYOU VERY MUCH FOR HELP
PHILLIP STREHLOW