Topaz brake light permanently on

87 Mercury Topaz has the brake light always on, even when the parking brake isn't on.
I checked the brake fluid level, the master cylinder is full.
Is that a brake problem or an electrical problem?
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have you checked the switch which operates from the park brake ?. it may well be jammed on , or the sensor on the pressure side of the master cylinder may be jammed ( unplug to find out), or is the light telling you the master cylinder is faulty , please elucidate .
Anonymous Sender wrote:

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