2006 Nissan Altima brakes problems

Tl* the contact owned a 2006 nissan altima. While driving 60 MPH, the contact's vehicle crashed into the rear of a semi-truck during inclement weather after depressing the brake pedal which failed to respond. The air bags failed to deploy. A police report was filed. The vehicle was towed to a yard and destroyed from the impact. The vehicle was not inspected and diagnosed by a repair facility or dealer. The driver sustained neck pains and whiplash, which required medical treatment.

Brakes do not engage when car has been left in cold, usually below freezing. Brakes usually engage after I hit the pedal once, twice hard. Dealership stated master cylinder problem and replaced; now less than two weeks later same thing is occurring however not as cold and not as frequent as during the major cold spell in area. Dealership has it again overnight to see if they can replicate issues.