2011 Hyundai Elantra brakes problems

Tl* the contact owns a 2011 hyundai elantra. The contact stated that while traveling approximately 45 MPH and attempting to decelerate, the brakes failed to respond. The contact then crashed into the rear of another vehicle. The contact sustained back injuries from the impact. The police were called and a report was filed. The vehicle was destroyed. The vehicle was not diagnosed and the manufacturer was not made aware of the failure. The failure mileage was 33,000.

The vehicle was purchased new and has approx. ~76k miles in 6.5 years of ownership. It is garaged when not in use. It has only ever been serviced at the same local hyundai service center. At the 72,501-mile service, the brakes were assigned a yellow score on a red-yellow-green scale but no remedial work was recommended. Since then I have noticed no obvious issues with the vehicle's braking system nor received any dashboard indicators of vehicle issues.