Brake Antilock Control Unit/module problems of the 2001 Chevrolet Cavalier

(1) while driving, going over small bumps or small pot holes, car begings to make a loud vibration noise up in the front wheel area and the anti lock brakes freeze and cause car to skid on dry or wet conditions. On several occasions traction control light stays lit then goes off after driving a period of time. (but no noise) took to local Chevrolet dealer, and found no problem, as of today, car continues to do the same incident. Been going off and on for the last 2yrs. Had brakes serviced, new pads and rotors turned, made things worse. . Car wobbles when comming to a stop. Also car grabs and lets off when stopping, feels like it's pushing then letting off the brakes off and on.