how to check ABS if they are good or not

I did the exact same thing on my Chevy Blazer - I intend to keep it that way .. IF I want the wheels to slide on the pavement - I will do so! .. I was driving WAY BEFORE the antilock brake systems were even an idea - nary a problem that ABS would have helped with AT ALL.. *Yellow* ABS light illumination *will still pass* the state vehicle safety inspection regulations - (here in Virginia) - if the *red brake light* is on - now that's a different story! A professional scan test of ABS module - while vehicle is being test driven - live data screen will display ABS functions so the culprit can be found. I will leave it at that.