Master cylinder is toast.
Look for fluid leaks at all four wheels, all brake hoses, and all metal fluid lines. All ok, replace the master cylinder attached to the metal vacuum booster between the cylinder and brake pedal. Refill the cylinder with fresh fluid and pump a number of times. If the pedal feels soft when you push it, re-bleed the brakes again.
If you have bled all 4 brakes thoroughly, from furthest away to closest, and pedal still goes straight to floor, I'd look at replacing the master cylinder.
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