Master Cylinder: Assembly

Use clean High Performance DOT 3 Motor Vehicle Brake Fluid C6AZ-19542-AB or equivalent DOT 3 fluid meeting Ford specification ESA-M6C25-A to lubricate the new piston assembly seals.
Carefully install the secondary piston assembly.

Fig 1: Installing Secondary Piston Assembly
Courtesy of FORD MOTOR CO.
Carefully install the primary piston assembly.

Fig 2: Installing Primary Piston Assembly
Courtesy of FORD MOTOR CO.
Install the snap ring.
1. Depress the primary piston.
2. Install the snap ring.
  
  Fig 3: Installing Snap Ring
  Courtesy of FORD MOTOR CO.
If so equipped, install the brake pressure switch.

Fig 4: Installing Brake Pressure Switch
Courtesy of FORD MOTOR CO.
Install the brake master cylinder. Refer to Brake Master Cylinder .