The contact owns a 2016 Mazda Mazda3. The contact stated while the vehicle was parked, the parking brake became firm and failed to engage as needed, causing the rear passengers side brake pads to not respond as needed after the vehicle was repaired under NHTSA Campaign Number: 17V393000 (PARKING BRAKE). The contact stated that the recall repair failed to fix the vehicle. There was no warning light illuminated. The contact checked the temperature of the brakes and noticed that the brakes were hotter than normal. A dealer was contacted. The vehicle was towed to the dealer where it was diagnosed that the parking brake actuator was rusted on the inside. The vehicle was not repaired. The manufacturer was notified of the failure and opened a case. The failure mileage was 188,900.