Lincoln 7L3Z-2140-A Cylinder Assembly - Master

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The brake master cylinder is located in the engine compartment, mounted to the power brake booster. Using a large syringe or equivalent, siphon the brake fluid from the brake master cylinder reservoir and dispose of it properly. CAUTION: Brake fluid will damage paint. Cover all painted surfaces and avoid spilling fluid during this procedure. Disconnect the electrical connector from the fluid level warning switch. 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 where they enter the brake master cylinder. To prevent rounding off the corners on these nuts, the use of a flare-nut wrench, which wraps around the nut, is preferred. 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. Pull the brake master cylinder off the studs and out of the engine compartment. Again, be careful not to spill the fluid as this is done. If a new brake master cylinder is being installed and is not equipped with a reservoir, transfer the reservoir from the old brake master cylinder to the new one using new seals. Remove the reservoir retaining pins and carefully pry the reservoir away from the old brake master cylinder. Use clean brake fluid to ease installation of the new seals and reservoir. Bench bleed the new brake master cylinder before installing it. Mount the brake master cylinder in a vise, with the jaws of the vise clamping on the mounting flange. Attach a pair of brake master cylinder bleeder tubes to the outlet ports of the brake master cylinder. Fill the reservoir with brake fluid of the recommended type. Slowly push the pistons into the brake master cylinder - air will be expelled from the pressure chambers and into the reservoir. Repeat the procedure until no more air bubbles are present. Remove the bleed tubes, one at a time, and install plugs in the open ports to prevent fluid leakage and air from entering. Install the reservoir cap. Install the brake master cylinder over the studs on the power brake booster and tighten the attaching nuts only finger light at this time. Note: Be sure to install a new O-ring into the sleeve of the brake master cylinder. Thread the brake line fittings into the brake master cylinder. Since the brake master cylinder is still a bit loose, it can be moved slightly in order for the fittings to thread in easily. Be careful not to cross-thread or strip the fittings as they are installed. Fully tighten the mounting nuts, then the brake line fittings.