My breaks pedal goes all the way down?

Hi I just changed the master cylinder and break booster on my 1997 Honda Del sol. The breaks still sink all the way down. I still have yet to bleed them. But how big of a difference will bleeding the air out of the system do the my sinking break pedal. Or is there another reason my break pedal would be doing this? Keep in mind I haven't bleed them yet. Any help would greatly be appricated.

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