Brake Master Cylinder problems of the 2008 Chevrolet Silverado

The contact owns a 2008 Chevrolet Silverado. While driving 25 mph while pulling a trailer, the brakes failed when the brake pedal was depressed. The vehicle finally stopped after depressing the brake pedal several times. The contact also stated that the service brake controller warning light illuminated. The vehicle was taken to a dealer where it was diagnosed that the brake master cylinder sensor needed to be replaced. The vehicle was repaired, but the failure recurred several times. The failure recurred every year and was repaired. On 2/3/16, the failure occurred again. It was diagnosed that the brake pedal switch needed to be replaced. The vehicle was repaired. The manufacturer was made aware of the failures. The failure mileage was 8,880.