Ford Mystique Owner's Manual page 14

Brake System Warning 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.
This light comes on when the parking brake is set, or if it is not
set, it comes on briefly when you turn the ignition to the
START position. It normally goes off shortly after the engine
starts and you release the parking brake. If the light stays on
after you have fully released the parking brake, have the
hydraulic brake system serviced by your dealer or a qualified
service technician.
The BRAKE light indicates that the brakes may not be
working properly. Have the brakes checked immediately.
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