I have a 1999 Pontiac Grand Prix GTP. For the past few weeks my ABS and Trac Off lights have been on. I've done some research and most of it points to the ABS module. The only difference from everything I've found online is that, when my lights are off, it's much more difficult to stop, I hear the grinding noise, and I have to begin slowing down a lot sooner. But when the lights are on (they usually come on after driving just a few minutes and usually stay on the entire trip) I have no problems stopping and don't hear any unusual sounds. I was planning on selling this car soon, and don't want to spend the $900 the local dealership quoted me (without seeing my car) so if anyone could point me in the right direction for what I should check and attempt to replace myself, I would greatly appreciate it.
I had my brakes and rotors (front) and one hub replaced a few months back.