2009 Chevrolet Silverado 3500 HD Brake Booster

There are 2 bolts attaching the Wheel Cylinder.

You should visually inspect the brake fluid level through the Brake Master Cylinder reservoir. If the brake fluid level is at or below the half-full point during routine fluid checks, the brake system should be inspected for wear and possible brake fluid leaks. If the brake fluid level is at or below the half-full point during routine fluid checks, and an inspection of the brake system did not reveal wear or brake fluid leaks, the brake fluid may be topped off up to the maximum-fill level. If brake system service was just completed, the brake fluid may be topped off up to the maximum-fill level. If the brake fluid level is above the half-full point, adding brake fluid is not recommended under normal conditions. If the brake fluid is to be added to the master cylinder reservoir, You should clean the outside of the reservoir on and around the reservoir cap before removing the cap and diaphragm.

You should remove the tire and wheel assemblies, prepare the brake bleeding equipment and the vehicle for a pressure bleed of the base hydraulic brake system, install a scan tool, perform the automated bleed procedure as instructed by the scan tool, press and hold the brake pedal to inspect for pedal firmness, repeat the bleed procedure completely, remove the scan tool, install the tire and wheel assemblies and then adjust the brake fluid level.