2015 Volkswagen Passat brakes problems

My pregnant fiance, her 3yr old son and I were driving on a city street approximately 35MPH. A vehicle cut off the truck in front of me and the truck in front of me slammed on their beaks, which made me slam on mine. I slammed on my breaks and it did not stop my vehicle, I tried to use my emergency break and did not stop the vehicle so I swerved over as much as possible to avoid my fiance's passenger side from being hit. I rear ended the truck in front of me. Everyone seatbelts locked except my fiance's.

2015 volkswagen passat erratic shifting and brakes either too soft and won't stop quickly or they lock up and I can't move the vehicle. The problems are mostly in town driving, but once occurred in highway driving going up a hill while passing. In that incident the tachometer went from 2 to 5 as the car lurched forward. While at a stop light, the engine revved up as if I were pressing the accelerator, although I was not.