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Brakes are hydraulic. pedal going right to the floor indicates either brake fluid is too low and air got in the system, or your master cylinder is defective. if air is in system due to low fluid, you will need to bleed the brake lines.
could be booster, could be air in system, could be master cylinder. Check reservoir. If it is out, you have leaks and air in lines. If no, listen for air leaks under dash as you push pedal. If air leak, replace booster.
If no air leak, check for vacuum at hose going into booster. If no vacuum, check hose connection to intake manifold.
If no leaks and booster is good, suspect master cylinder.
Pull both wheels off, do one at a time, use the other side as a guide to put it back together, I am a retired auto mechanic and this is the best way to do the job, also remember the larger shoe always goes to the back.