NHTSA Complaint #11547262 — 2017 CHRYSLER PACIFICA

I received P258B warning and further diagnosis came to know that C0021-02 and C1252-92 warnings. While applying breaks i am getting hissing noise and break pedal pushes me back where i have to apply lot of pressure to stop the vehicle. This is happening only when i press the pedals hard. I did diagnosis and noticed that the break vaccum pump fuse gone and replaced the same again it blown. Then realized that that the Vaccum pump it self is not working and the same is ordered and replaced. Now the vaccum pump issue is fixed but still the break pedals are hard and getting hissing noise while applying breaks. Now i may need to change the break booster to get this fixed.