I will check the banacing valve. Since I installed the new master cylinder and bleed the brakes I can’t get the luminated brake light to go off unles I remove the wire from the valve.
That would definitely indicate an issue with the valve.
The procedure to recenter the valve is to bleed the brakes in this order- passenger rear, drivers rear, passenger front, drivers front. There’s a valve with a spring inside the factory combination valve that sets the front/rear bias, if it gets out of whack it messes with the balance and that could mean you’re doing most of your braking with the rear drums and not the front. The light indicates there is an issue there.
Got to sort that out before you make any other changes. The light should go out when the valve is working properly.