GM 19420962 CYLINDER ASM,BRK MAS

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The brake master cylinder is located in the engine compartment and is mounted to the power brake booster. To remove the brake master cylinder, start by removing as much fluid as possible from the reservoir using a syringe or turkey baster. Place rags under the fluid fittings and prepare caps or plastic bags to cover the ends of the lines once they are disconnected. Loosen the fittings at the ends of the brake lines and plug the ends to prevent contamination. Disconnect the electrical connector at the brake fluid level switch, if equipped, and remove the nuts attaching the brake master cylinder to the power booster. Carefully pull the brake master cylinder off the studs and out of the engine compartment. If installing a new brake master cylinder, remove the reservoir from the old one and transfer it to the new brake master cylinder. To install the new brake master cylinder, bench bleed it first by mounting it in a vise and attaching 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. Install the brake master cylinder over the studs on the power brake booster and tighten the attaching nuts. Thread the brake line fittings into the brake master cylinder and fully tighten them. 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. If replacing the reservoir or O-ring, remove as much fluid as possible, detach the reservoir from the brake master cylinder, replace the O-rings if necessary, lubricate the new O-rings, and secure the reservoir back onto the brake master cylinder. Refill the reservoir with brake fluid, check for leaks, and bleed the brake master cylinder.

To remove the brake master cylinder, first disconnect the cable from the negative battery terminal and unplug the electrical connector for the fluid level warning switch. Remove as much fluid as possible from the reservoir and prepare caps or plastic bags to cover the ends of the lines once they're disconnected. Loosen the fittings at the ends of the brake lines where they enter the brake master cylinder and pull the brake lines away from the brake master cylinder, plugging the ends to prevent contamination. Remove the nuts attaching the brake master cylinder to the power booster and pull the brake master cylinder off the studs. To install the new brake master cylinder, bench bleed it before installing it by mounting it in a vise and attaching a pair of brake master cylinder bleeder tubes to the outlet ports. Fill the reservoir with brake fluid of the recommended type and slowly push the pistons into the brake master cylinder until no more air bubbles are present. Remove the bleed tubes and install plugs in the open ports to prevent fluid leakage and air from entering. Replace the o-ring seal on the end of the brake master cylinder and install it to the booster, leaving the mounting nuts finger tight for now. Thread the brake line fittings into the brake master cylinder and tighten the mounting nuts to the torque specifications. Fill the brake master cylinder reservoir with fluid, then bleed the lines at the brake master cylinder, followed by bleeding the remainder of the brake system. Confirm that the brakes are fully operational before resuming normal driving.

The master cylinder is located in the engine compartment and is mounted to the power brake booster.

Bench bleed the new master cylinder before installing it.

Remove the nuts attaching the master cylinder to the power booster and pull the master cylinder off the studs.