2014 Ford Escape brakes problems

Tl* the contact owns a 2014 ford escape. The contact stated that while driving approximately 20 MPH going down a hill with the brakes engaged, the brake pedal went to the floor and failed to respond without warning. The vehicle crashed into a granite wall and rolled over landing in an upright position. The contact mentioned that only the side airbags deployed. No police report was filed. The contact was sore but did not seek medical attention. The vehicle had not been removed from the property.

Picked up 2014 ford escape 1.6 ecoboost- october 2013- engine RPM' s rev to 3-4 for no reason - sporadically- when remote started, and when electric starting car. Brakes loud whistling noises- comes and goes- auto lift gate opens half way sometimes, closes on you when your loading things sometimes, rear door behind driver -child locks on- cant turn off- passenger cant get out of that side of car- no heat! Temp gauge jumps from c to h then back to c.