GM 88971208 Cylinder,Brake Master

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To remove the brake master cylinder, start by removing the cover from the air filter housing and unplugging the electrical connector for the brake fluid level warning switch. If the vehicle has a manual transaxle, disconnect the fluid line connecting the brake master cylinder reservoir to the clutch master cylinder. Remove as much fluid as possible from the reservoir and clamp off the fluid feed hose to the clutch master cylinder if necessary. Loosen the fittings at the ends of the brake lines where they enter the brake master cylinder using a flare-nut wrench. Pull the brake lines away from the brake master cylinder and plug the ends. Remove the nuts attaching the brake master cylinder to the power booster and carefully pull the brake master cylinder off the studs. To install the new brake master cylinder, bench bleed it first by mounting it in a vise and attaching brake master cylinder bleeder tubes to the outlet ports. Fill the reservoir with brake fluid and slowly push the pistons into the brake master cylinder to expel air. Repeat until no more air bubbles are present. Remove the bleed tubes and install plugs in the open ports. Adjust the booster pushrod length if necessary and install a new O-ring on the brake master cylinder body. Install the reservoir cover and then the brake master cylinder over the studs on the power brake booster. Thread the brake line fittings into the brake master cylinder and fully tighten the mounting nuts and brake line fittings. Fill the brake master cylinder reservoir with fluid and bleed the brake master cylinder and brake system. Test the operation of the brake system before placing the vehicle into normal service.