After replacing the master cylinder, and bleeding new one before installing, my dash brake light stays on all the time.

 

Why did you replace the master cylinder ?

 

Did you plug the sensor back in?

 

Check all the connections you unplugged. A lot of times they were forgotten when plugging things back in or they didn't get fully seated back in place. Basically if it was ok before then work your way back through everything you just did to make sure you didn't forget something simple.

 

I had to replace the master cylinder because the brake paddle was going down past the accelerator paddle. I checked both the connectors I took off and removed them and replaced them once again. Still brake light is on.

 

Dumb question... but your emergency brake pedal is all the way up, right?