05 sierra gear swap

[Cornbread]

Done a gear swap on my 05 sierra and the abs and brake light is on. It comes on after starting the truck and going down the road. Bought a tuner reprogrammed the tire size and gear ratio. I 'm at a loss!!! Has anybody had this issue before? Thanks!

 

[ctnstabber]

Can you do a code check with a scanner
That would be where I would start
you may just have a bad sensor