Brake warning light always on

[Flynn]

Okay I think this is related to my instrument cluster fault since it cropped up after I removed and replaced the cluster. The brake warning light is always on except when I push the brake pedal then it goes off. I have checked the plug on the master cylinder reservoir and the handbrake button. Now, I know when you press the brakes and the light comes on it means the pads are low, but the other way around I'm clueless.