There is a fault with the relay that go to the break lights. There may also be a fuse or connection in the fuse box itself causing this issue.
replace fuse
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take it to a garrage
BAD BRAKE LIGHT SWITCH AT TOP OF BRAKE PEDAL
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the alarm
In a 1981 Corvette, the fuse for the brake lights is typically located in the fuse panel under the dashboard on the driver's side. It is usually a 15-amp fuse, often labeled specifically for the brake lights. Always consult the owner's manual or the fuse panel cover for precise details, as designs may vary. If the brake lights are not functioning, checking this fuse should be one of the first troubleshooting steps.
Change brake light bulbs Just remove the rear license plate. You can change the backup lights and brake light easily.
yes there was an alarm on some 1998s look under the steering by ther brake pedal there is a big box that should say code alarm system unhook the plugs from this it will disarm alarm and let you do what you want
Battery, belts, blinker lights, brackets, brakes, brake lights and bumper are car parts. Bucket seats, Back seat, Brake booster, Brake pedal, Bulbs, Back-up lights, Bearings, Blower motor, Bezel, Back-up alarm,
The switch could be bad or the wire could be burned out.