Brakes and/or power steering

The day after purchasing this van the brakes and power steering seemed to go out. Brakes go all the way to floor and there is no power steering. After doing some research I have discovered the possibility of it being the brakes booster. Is this a possibility or could it be something else? And if so, how expensive and how hard is it to fix? My wife and I are in love with this van and all the room it offers and would love to get this fixed ASAP if possible. Thank you so much!