If i understand you correctly it sounds like you have put the sensor to far in the bracket and the wheel has taken the end off the sensor. This would cause the abs light to come on the dash as it wont be picking up the frequency from the sensor. Im sure you will need a new sensor mate!!

They should have an air gap between the sensor and the wheel of about 0.75mm, atleast on the trains they do lol. Same basic principle!!

Bruce