2006 Chevrolet Colorado Brake Booster

The proper way is to install the Wheel Cylinder to the backing plate, install the wheel cylinder mounting bolts, install the brake line to the wheel cylinder, install the brake line fitting, and then install the rear brake shoes.

You should 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, clean the outside of the reservoir on and around the reservoir cap before removing the cap and diaphragm. Use only Delco Supreme 11 (R), GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.

You should not allow the vehicle to be driven until it is diagnosed and repaired.