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Master Cylinder Priming - In Vehicle Or Bench

NOTE: When a new brake master cylinder has been installed or the system has been emptied or partially emptied, it must be primed to prevent air from entering the system.
  1. For in-vehicle priming, disconnect the brake lines from the brake master cylinder.
  2. For bench priming, mount the brake master cylinder in a vise and install short brake tubes with the ends bent into the brake master cylinder reservoir.
  3. Fill the brake master cylinder reservoir with High Performance DOT 3 Brake Fluid (C6AZ-19542-AB) or DOT 3 equivalent meeting Ford specification ESA-M6C25-A (United States and Canada only). If DOT 3 is not available, use Ford High Performance DOT 4 Brake Fluid meeting Ford specification SAE J1704 or equivalent. Refill the brake master cylinder reservoir as necessary.
  4. Slowly depress the primary piston or, for in-vehicle priming, have an assistant slowly pump the brake pedal until clear brake fluid flows from both brake tubes with no air bubbles.
  5. If necessary, install the brake master cylinder into the vehicle.
  6. Remove the short brake tubes and install the master cylinder outlet tubes.
  7. Have an assistant depress and hold the brake pedal.
  8. Loosen the brake outlet tubes at the master cylinder one at a time.
  9. Tighten the outlet tubes to specification. See TORQUE SPECIFICATIONS .
  10. Repeat the above three steps until no air bubbles are seen in the expelled brake fluid.
  11. Bleed the brake system. See MANUAL BLEEDING  or PRESSURE BLEEDING  .
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