The vehicle was unknowingly purchased with an improperly assembled braking system from which is formally known as Koeppel Nissan. The braking assembly failed during operation, resulting in loss of proper braking capability and causing a collision. The braking failure created a serious safety risk to the myself (the driver) and others on the roadway. There were no warning lights, dashboard messages, or other indicators prior to the braking failure. The issue with the braking assembly was not identified at the time of purchase and when the vehicle was returned to Koeppel Nissan to have cosmetic damages fixed. A request was made to thoroughly check of the braking system. After repairs, Koeppel Nissan assured there were no issues with braking system. It was discovered months afterward by Thruway Nissan dealership that the rear rotor pads were mismatched and the driver rear pad was installed upside down. The issue was viewed by a Thruway Nissan service technician, who identified the improper braking assembly. The vehicle has not yet been inspected by Nissan Motor Corporation Consumer Affairs for this issue but has been reported. The vehicle and the braking system components are available for inspection upon request.