Lincoln 2L1Z-2140-BB Master Cylinder Repair Kit

To start the overhaul and installation process, pry the reservoir off the master cylinder and remove the old reservoir grommets, replacing them if cracked or torn. Depress the primary piston, remove the snap-ring, and take out the fluid control valve and brake pressure switch if present. Remove the primary and secondary piston assemblies from the cylinder bore, potentially tapping the master cylinder against a block of wood to expel the secondary piston.

Fill the reservoirs with brake fluid, support the master cylinder to prevent spills, and hold fingers tightly over the holes where the brake lines connect to prevent air from entering as you stroke the piston to expel air. Carefully install the master cylinder by reversing the removal steps and bleed the brake system to complete the process.