Two problems related to brake master cylinder have been reported for the 2005 Chevrolet Suburban. The most recently reported issues are listed below.
First incident eastern 05/19/2014 aprox 119000 miles: after hitting the brakes hard to avoid a vehicle that pulled in front of me, the brakes failed (brake pedal would go to the floor with little braking action). Managed to safely stop. Found burst brake line in the rear end of vehicle. Two rear corroded rear brake lines replaced by local repair shop. Second incident milford 09/17/2015 127336 miles: hit brakes going down driveway. Brakes were soft and sank to floor. Brake line going to front passenger wheel was burst. All the brake fluid drained quickly out of the master cylinder onto the driveway. Ordered acdelco 22932592 gm original equipment hydraulic brake pipe kit and am in the process of replacing all brake lines as all of them other than the two replaced in PA are very corroded. The replacement lines are not really oem as they have a nylon coating for better corrosion protection.
Loss of brakes due to sudden loss of brake fluid from rusted main line off of master cylinder.