I have a 2001 Jetta GLS.My ABS light is on,it keeps going on and off at times, i feel the kicks of the pedals at times and when I do it feels abnormal. I took my car to get an inspection about a month ago and I believe the mechanics forgot to put a bolt in which I found in my car can this relate to the issue?Can any one provide me with more information about my ABS light being on?