Master Cylinder: Reassembly

Install check valve and spring in drum brake outlet (if removed). Using a spare tubing nut, press tube seat insert into place (if removed). Turn nut until tube seat insert bottoms. Remove nut and inspect outlet for burrs or shavings.
Coat bore of cylinder and piston assemblies with clean brake fluid. Install secondary and primary piston assemblies into bore. Press primary piston inward and install snap ring or stop bolt. Install push rod (if equipped).
On diagonal split master cylinder, install fluid control valve using a 12 mm socket.
On 2-piece master cylinders, lubricate grommets with clean brake fluid and install in master cylinder. Ensure that grommets are properly seated. Place reservoir on hard surface and install plastic reservoir with a rocking motion.
Fill reservoir with clean brake fluid and bleed master cylinder. See BENCH BLEEDING MASTER CYLINDER under BRAKE SYSTEM BLEEDING in this article.

Fig 1: Diagonal Split Master Cylinder (Except Probe)

Courtesy of FORD MOTOR CO.

Fig 2: Master Cylinder (Probe)

Courtesy of FORD MOTOR CO.