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Brake Master Cylinder - Bypass Condition

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the master cylinder. Refer to BRAKE SYSTEM INSPECTION .
  2. Disconnect the brake tubes from the master cylinder.
  3. Plug the outlet ports of the master cylinder.
  4. NOTE: Make sure that the outlet port plugs do not show signs of leakage.

    Lightly apply the brakes and hold for 10 seconds. Release the brakes and then reapply with heavy force. If brake pedal height cannot be maintained, the brake master cylinder has an internal leak and a new brake master cylinder must be installed.

    • If brake pedal height is maintained, reinstall brake tubes and tighten to specifications. Refer to SPECIFICATIONS . After installation, bleed the brake system. Refer to BRAKE SYSTEM BLEEDING .
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