2001 International 4700 Brake question

2001 International 4700 dt 466
hydraulic brakes

I replaced the brake pads all around. Compressed the calipers and fluid pushed out of reservoir "normal" and put back together and everything works great.

The issue I am having is the brake pressure light will come on after driving and I go to stop. Once it's on it stays on.

Everything is normal other than the light coming on. Brake motor comes on when truck is off and brakes are pressed, /when key is on and not running the brake motor runs like it should,

Any idea? I have talked to a few mechanics and one told me to pull sensor off the side of master cylinder and see if I see a rod. It looks like the rod is touching the sensor and not in the right position.