2004 Lexus RX330 brakes problems

2 to 3 years prior to this accident I was coming to a stop light and the brakes did not work, but only for a few seconds. I reported this to my husband and he took it to several mechanics but did not find anything wrong with the vehicle, my husband has owned a auto parts store for 40 years and knows a few qualified mechanics.

Tl* the contact owns a 2004 lexus rx330. While backing up the vehicle in the driveway at a low rate of speed, the vehicle suddenly experienced unintended acceleration and crashed into the garage and house. There were no injuries and a police report was not filed. During the incident, the vehicle failed to immediately stop while depressing the brake pedal. The cause of the failure was not diagnosed or repaired. The manufacturer was not notified. The failure mileage was 119,000.