Ford 1997 Crown Victoria Manual page 45

If the anti-lock brake system warning
light remains on or comes on while
driving, have the braking system checked
by a qualified service technician as soon
as possible.
NOTE: If a fault occurs in the anti-lock
system, and the brake warning light is
not lit, the anti-lock system is disabled
but normal brake function remains
operational.
Brake System Light
The warning light for the brakes can show two
things — that the parking brake is not fully
released, or that the brake fluid level is low in
the master cylinder reservoir. If the fluid level is
low, the brake system should be checked by a
qualified service technician.
The brake system light
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RWARNING