Dash brake light stays on

[muley]

I've got an 89 GMC K2500 that the brake lights would stay on after you got off the pedal. You had to pull the brake pedal back to get it to shut off. I changed the brake switch under the dash and that fixed that problem. But the next time I drove it, the brake light in the dash came on. It doesn't flash, it's just on. If you engage the E brake, the light gets brighter.
Did changing the switch cause this light to go on? The brakes act perfectly fine. Just an annoying light.
Hoping for a solution here. Thanks for any help.