Lincoln F7AZ-2140-AA Master Cylinder Assembly

In order to overhaul the brake master cylinder, consider whether you can get a new one at a reasonable price. Put some rags underneath the brake line fittings and cover up the line ends when you disconnect them. Use a flare-nut wrench to unscrew the tube nuts, plug up their ends and also disconnect the brake warning light connector. Take off the mounting nuts and separate the brake master cylinder from it. Remove the reservoir cap and use a brake system cleaner to clean both it and the cylinder. Replace if necessary by examining for damage in bore. Then grease new reservoir grommets and push them into cylinder body. Grease bore and piston assemblies, and press body onto the reservoir. Insert piston assemblies, then snap ring should be installed before capping is attached on top of the diaphragm that may need changing if damaged. To do bench bleed, fill both reservoirs with fluid as well as place plugs to expel air from those fittings.

The brake master cylinders on the vehicles covered are rebuildable, but if assembled incorrectly or with the wrong rebuild kit seals, they may continue to leak after overhaul. Avoid honing the brake master cylinder bore as it may lead to improper fit with the rebuild kit. If the bore is seriously pitted or corroded, consider replacing it with a new or professionally rebuilt unit or consult an automotive machine shop. During removal, cover brake line fittings with rags and plug the ends of the lines to prevent contamination. Unplug the brake warning light connector, remove the brake master cylinder mounting nuts, and detach it from the brake booster or Hydro-Boost unit. Before overhauling, inspect and clean the brake master cylinder and components. If any corrosion or damage is found, replace the brake master cylinder body with a new one. Lubricate and install new reservoir grommets and diaphragm if applicable. Bench bleed the brake master cylinder before installation and carefully install it by following the reverse of the removal steps. Be sure to bleed the brakes after installation.

In order to overhaul the brake master cylinder, consider whether you can get a new one at a reasonable price. Put some rags underneath the brake line fittings and cover up the line ends when you disconnect them. Use a flare-nut wrench to unscrew the tube nuts, plug up their ends and also disconnect the brake warning light connector. Take off the mounting nuts and separate the brake master cylinder from it. Remove the reservoir cap and use a brake system cleaner to clean both it and the cylinder. Replace if necessary by examining for damage in bore. Then grease new reservoir grommets and push them into cylinder body. Grease bore and piston assemblies, and press body onto the reservoir. Insert piston assemblies, then snap ring should be installed before capping is attached on top of the diaphragm that may need changing if damaged. To do bench bleed, fill both reservoirs with fluid as well as place plugs to expel air from those fittings.