Chevrolet 19418187 CYLINDER ASM,BRK MAS

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The Brake Master Cylinder is located at the left rear corner of the engine compartment, mounted to the power brake booster. Begin by removing as much fluid as possible from the reservoir using a syringe or an old turkey baster. Place rags under the fluid fittings and prepare caps or plastic bags to cover the ends of the lines once disconnected, taking care to avoid spilling brake fluid, which can damage paint. Disconnect the electrical connector from the brake fluid level switch on the Brake Master Cylinder reservoir. Loosen the fittings at the ends of the brake lines where they enter the Brake Master Cylinder, using a flare nut wrench to prevent rounding off the corners. Pull the brake lines slightly away from the Brake Master Cylinder and plug the ends to prevent contamination. Remove the nuts attaching the Brake Master Cylinder to the power booster, then pull the Brake Master Cylinder off the studs and out of the engine compartment, again being cautious not to spill fluid. If installing a new Brake Master Cylinder that does not come with a reservoir, remove the retaining fasteners and reservoir from the old Brake Master Cylinder and transfer it to the new one, replacing the O-rings with new ones. Before installation, bench bleed the new Brake Master Cylinder by mounting it in a vise and attaching a pair of bleeder tubes to the outlet ports, filling the reservoir with the recommended brake fluid. Slowly push the pistons into the Brake Master Cylinder to expel air into the reservoir, repeating the process until no more air bubbles are present. Remove the bleed tubes one at a time, install plugs in the open ports, and then install the reservoir cap. If the old Brake Master Cylinder had a seal, install a new seal into the groove of the Brake Master Cylinder, then position the Brake Master Cylinder over the studs on the power brake booster and tighten the attaching nuts finger-tight. Thread the brake line fittings into the Brake Master Cylinder, adjusting the position slightly if needed to avoid stripping the threads. Tighten the mounting nuts to the specified torque and secure the brake line fittings. Fill the Brake Master Cylinder reservoir with fluid, then bleed the Brake Master Cylinder and the brake system by having an assistant depress the brake pedal and hold it to the floor while loosening the front brake line fitting to allow air and fluid to escape, repeating this on both fittings until the fluid is clear of air bubbles. Have plenty of rags on hand to catch any fluid, as brake fluid can ruin painted surfaces, and rinse the area under the Brake Master Cylinder with clean water after the bleeding procedure. Finally, test the operation of the brake system carefully before placing the vehicle into normal service.