Did you disconnect a wheel speed sensor accidentally?
No there isn't anything disconnected
There's nothing disconnected
It probably was not a coincidence that the ABS light came on after you did the brakes but have the ABS codes read to know what is wrong.
Looking for a Used Tahoe in your area?
CarGurus has 27,743 nationwide Tahoe listings starting at $1,700.
Search Chevrolet Tahoe Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Tahoe Experts