Help! My 2004 prius is having issues: Brakes and Pack Battery

Hello everyone, I am going to try and jump straight to the point. The other day, went to drive my prius and when I went to back up, the brakes hardly worked and the pedal was not sensitive and hardly worked as well. My car also was running and trying to charge the battery at a high rate, and could not keep the charge on the battery. I ran a scanner and it produced a few codes-P3015, P0A80. I found these relate to the Pack battery, so being a college student and not able to afford a new battery, I decided to take everything out and test the volts in each module. I found that 1 of my modules, #9, was running at 6.7 instead of 7.9. I replaced it, now runs at 7.9. After turning my car back on, the brakes are still not functioning at all. Now is running code P3056 since i changed the module. Any tips on anything? not really sure what the breaks are doing. All the brake error lights are on, and the emergency brake light as well, even though it is not engaged.
I have pictures if someone is interested.
Thanks everyone,
Seth