replaced master cylinder blead brakes still pedel still goes to floor?
Either you didn’t get the brakes bled properly - including bleeding the master cylinder first, all 4 wheels next or you have a leak.
The best way, is to bench bleed the master before you install it.
Yosemite
If the vehicle has ABS, the brakes must be bled using a pressure bleeder when the brake system is opened up.
Tester