My brake sinks to the floor and it can't be the booster right?
because bad booster = firm pedal?....
i looked around my master cylinder and i dont really see any leaks and everytime i check the fluid its always at the same level....
What other components could lead to this problem? I also have a ABS light saying 8-1 "abs function"

 

I had that same problem and it was my master cylinder cuz the master clyinder cant seal and get pressure, which is why ur pedal goes to the floor. air in the lines could cause problems too.

 

depending on the year, if its a hydraulic clutch, then it may be a bad clutch release cylinder..

 

huh? Does the clutch having anything to do with the brakes? I might change my cylinder but is there a way to test if its bad before i spend money on a new one..

 

is your master cylinder. but before replacing it make sure all the brake lines, calipers or wheel cylinder aren't leaking.
Yea, What is DJYoshaBYD taking about?