Breaks pedal goes all the way to the floor ?
Your brakes are broke.
Not sure this is a question, so I will leave this
Ford Mustang: Brake Pedal Going to Floor Diagnosis | Drivetrain Resource
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Are you looking to do the work yourself and asking for help, or having it towed to a shop for repairs??
Probably either a severe brake fluid leak or the brake master cylinder (what converts pedal motion to break fluid pressure) has failed.
Only a job for an experienced mechanic. Take it to a brake specialist place.