just added this today, but it is not going to help with the ABS light, get your ABS codes read:
How to fix that over-sensitive system by Jeff Rouse:
My brakes sucked. A crack in the road would set the ABS off. I did a few things and it works way better now. After I took my Amigo back to the dealer ("everything checks out within manufacturers specs" ) for difficulty stopping twice, I bled the brakes. This made a HUGE difference. Cost: $0
Then I had some Earl's Plumbing steel braded brake lines custom made (I added 2" in front and 4" in back for future mods) and replaced all five stock rubber lines. HUGE, HUGE improvement. $150
Then I lifted my truck 3" and put rancho 9000's on. I don't know why but this helped quite a bit too. Maybe from it not getting jarred so hard when I'd hit a bump. Beats me, it helped a lot. $400 CP style lift.
I put 265/75/16 Futura Dakata's all around. Good improvement. $510 for five tires - mounted, etc
Next I changed brake pads all around. Axxis metal master. Some improvement. $70 *note, non-OEM pads have a tendency to squeal with used with OEM rotors.
Finally, I swapped the front rotors for Powerstop cross-drilled rotors. (I tow a lot, slotted are better for most people). I left the rear stock - for now. Great improvement in stopping, some improvement in ABS. $230 for the pair.
At first I thought my ABS didn't work anymore, because it didn't' come on for at least six months. Then when driving in the snow I jammed the brakes on one day and... it was still there working like ABS should. Since then it has only come on a few times, and only under extreme braking on bumpy surfaces.