93 C15 P/U Break Troubles

Changed break Master Break Cylinder, break pads and drum break pads(on rear) all look good, but break light still stays on on dash. Any suggestions as to what might be going on???? Thanks in advance.

I've had to disconnect the battery ground for a minute on some.
Others the switch is on the distribution valve if its moved one way or the other the light will stay on. Try opening a back bleed screw and check if it goes out. Normally bleeding either the front or back will turn it off.
I assume you don't have Anti Lock.

Unfortunately, yes, I do have the anti lock set up. It may be something going on with that but, would have to take that to a shop. Thanks for sharing the advice

http://www.aa1car.com/library/abstestr.htm You can look for something disconnected or a loose ring at the rotor.