Mercury 1996 Grand Marquis Manual page 271

If the fluid is low, carefully clean and remove
the cap from the reservoir. Fill the reservoir to
the MAX line with Ford High Performance
DOT 3 Brake Fluid C6AZ-19542-AA,
C6AZ-19542-BA, or equivalent DOT 3 fluid
meeting Ford specification ESA-M6C25-A.
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.
The brake fluid reservoir
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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