If you ain't using braided hoses, then it might be worth clamping off all your hoses with vice grips. If your pedal remains sh1te then your fault is in the master cylinder or rod adjustment. If your pedal is now solid, then you have air in or around one of your callipers.

What you will need to do now is get a mate to sit in tour car with his foot hard on the brake.
Take off each of the vice grips in turn. Ask your mate which vice grip allowed the most travel and there lies your problem. Great in theory but not always easy or clear cut in practice.

HTH