Q: Skuishy brakes on 1994 Ford Mustang

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The pedal goes all the way to the floor. I just installed new pads, but I still have The soft pedal.
(2) Answers
many reason for low pedal.
check fluid level.
check pins on the calipers for sticking on all 4 wheels.
a hydraulis leak somewhere in the lines.
a bad master cylinder.

Did you bleed the brake? If you pump the brakes and they stiffen up after a couple of pumps its a good indication that there is air in the brake line.