Three days before the accident, I experienced an unusual issue with the vehicle. When I pressed the brake pedal to start the vehicle, I heard an unusual sound that I had not normally heard when starting the car. It was heard from the outside of my car and as well as I felt it on brakes as I pressed it. My neighbor was present and advised me to turn the vehicle off and restart it. After I turned the vehicle off and restarted it, the sound was no longer present. Three days later, while driving the vehicle, I attempted to apply the brakes to slow/stop, but the vehicle did not respond as expected. I pressed the brake pedal in an attempt to stop the vehicle but was unable to stop, resulting in a collision. Because of the unusual sound that occurred while pressing the brake pedal three days earlier and the subsequent loss of braking ability during the accident, I am concerned that there may have been a malfunction involving the vehicle's braking system or a related component. The accident was reported to law enforcement, and the vehicle sustained significant damage. My insurance company subsequently determined that the vehicle was a total loss. I am submitting this complaint so that the incident and the earlier warning sign can be documented and reviewed by NHTSA as a potential vehicle safety issue.