Brake question??

[1980chevy4x4]

MY brake pedel is very soft so soft that every time i push it in the brake light comes on in the dash. I check the MC fluid and it is fine. I think one thing is that i think have to re bleed but, on time i had the emergency brake on and ddint notice i drove with it on and it felt like the brakes were they way they were supposed to be, but when i took the EB off it was back to the same old soft pedle. Do you guys think its just needs to be rebled or maybe new pads? OBTW it feels like its the back brakes more than the front.