ABS problem with 2002 Ford Ranger Edge lift

Recently I lifted My New 2002 Ford Ranger edge. The Shop used the Ford Ranger 2001 spindel kit in the front with some slight modifications needed. I also Upgraded my tire size from the standard size to a 32". Now when I brake below 5mph my ABS kicks in causing the break peddel to pump. I checked with the Ford dealer about changing my performance chip to the larger size tire to correct the missmatch but they said the chip is already set to the largest size tire in the Edge Rangers. What Can I do to correct this problem other than going back to the original tires