2009 Chevrolet Suburban 1500 Brake Booster

You should secure the mounting flange of the Brake Master Cylinder in a bench vise so that the rear of the primary piston is accessible, remove the master cylinder reservoir cap and diaphragm, install suitable fittings to the master cylinder ports that match the type of flare seat required and also provide for hose attachment, install transparent hoses to the fittings installed to the master cylinder ports, then route the hoses into the master cylinder reservoir, fill the master cylinder reservoir to at least the half-way point with GM approved brake fluid from a clean, sealed brake fluid container, ensure that the ends of the transparent hoses running into the master cylinder reservoir are fully submerged in the brake fluid, using a smooth, round-ended tool, depress and release the primary piston as far as it will travel, a depth of about 25 mm (1 in), several times. Observe the flow of fluid coming from the ports, continue to depress and release the primary piston until fluid flows freely from the ports with no evidence of air bubbles, remove the transparent hoses from the master cylinder reservoir, install the master cylinder reservoir cap and diaphragm, remove the fittings with the transparent hoses from the master cylinder ports, wrap the master cylinder with a clean shop cloth to prevent brake fluid spills and remove the master cylinder from the vise.

You should lubricate the master cylinder reservoir seals and the outer surface area of the reservoir-to-housing barrels with GM-approved brake fluid from a clean, sealed brake fluid container. If reinstalling the master cylinder reservoir, clean the reservoir with denatured alcohol, or equivalent, and allow it to dry. You should install the master cylinder reservoir seals to the master cylinder, ensure the master cylinder reservoir seals are fully seated in the master cylinder body, lubricate the master cylinder reservoir-to-master cylinder barrels with GM-approved brake fluid from a clean, sealed brake fluid container, press the master cylinder reservoir straight downward and install the reservoir to the master cylinder, install the master cylinder reservoir bolts and tighten to 8 Nm(71 lb in), connect the brake fluid level indicator switch electrical connector and fill the master cylinder reservoir.

When adding fluid to the brake master cylinder reservoir, 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.