ABS shaking everytime I press brake pedal since rear wheel bearing change

[THE NEW GUY]

Hello Guys,
Since I changed my rear wheel bearings some months ago, I noticed my ABS is activating every single time I brake. First the ABS light came on so I added some spacers to reduce the distance between the ABS sensors and the target crown. after that, the ABS light does not come on but I feel the ABS pump is activating each time I brake, right at the point when I release a little the pressure on the brake pedal. During summer, to avoid this anuance, I removed the big fuse of the ABS pump, but now, in winter, with all this ice, I need my ABS back so I replace the fuse and the problem araised again. Do you think one of my ABS sensor was damaged during the bearing replacement process?
Any comment will help.
Thanks.