This brake master cylinder is a crucial component for your 2009 GMC Sierra 1500. It is designed to fit perfectly and function seamlessly with your vehicle. The cylinder has been well-maintained and is in excellent shape, ensuring that it will provide reliable performance for years to come. The part number for this master cylinder is 541-00261 and it is a genuine OEM part. It is compatible with 5.3 engines and has a stock number of AB1447. This item is perfect for those looking to replace their master cylinder and maintain the safety of their vehicle.