Brake master cylinder for FC3S brake conversion

[Hachi Go]

Hey guys,

I'm in the finishing stages of my AE85 project, which has included a BEAMS powerplant, Hilux diff, and upgradded brakes. Everything seems to be coming together nicely, except for the brakes.

The brake set up is as follows:

Front: FC3S 4 pot calipers with Nissan Cefiro discs
Rear - S13 K's disc brakes and calipers

The brake lines have been blead thoroughly, but I still have barely any brake feel. We're still running the stock AE85 brake master cylinder. Could this be the issue? I know there are a few other people that are running FC3S brakes. Did you have to upgrade the brake master cylinder? If so, what did you use?