It's not clear to me if you have a pedal, and it sinks to the floor?
If so, either a leak somewhere, or bad master --is bypassing internally
Or never had a pedal, and even after bleeding it went to the floor right away?
If the last, could be air, could be shoe adjustment, or possibly a bad master
Adjust the shoes up TIGHT so you cannot turn the wheels. Now see if you get a higher, fairly hard pedal. (Pedal firmness on power brakes can be subjective, as the power booster adds a certain amount of "mushy" to the feel)
