Ford F series Owner's Manual page 268

Brake fluid is toxic.
If brake fluid contacts eyes, flush eyes with
running water for 15 minutes. Get medical
attention if irritation persists. If taken internally,
drink water and induce vomiting. Get medical
attention immediately.
If the fluid is low, carefully clean and remove
the filler cap from the reservoir. Fill the
reservoir to the MAX line with Ford High
Performance DOT 3 Brake Fluid C6AZ-19542-AB
or DOT 3 equivalent fluid meeting Ford
specification ESA-M6C25-A.
NOTE: If brake fluid is spilled on painted
surfaces, it must be flushed and wiped
away immediately. Brake fluid may
dissolve the paint finish on your
vehicle.
If you use a brake fluid that is not DOT
3, you will cause permanent damage to
your brakes.
Do not fill the reservoir above the MAX line.
If you find that the fluid level is excessively low
— below the seam or ridge on the outside of the
plastic reservoir — have the brake system
inspected.
Do not let the reservoir for the master
cylinder run dry. This may cause the
brakes to fail.
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