Depress the brake pedal and see,if all the brake lights are not coming ON,then its faulty brake light switch.If any of the bulb is coming ON,then its not the switch in most cases.
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In that case,that particular side brake light bulb is faulty,which is not coming ON.
In some cases,the brake light bulb wire,which runs from switch to bulb connector is short and that causes faulty.
But if all bulbs are not coming ON,then mostly is faulty brake light switch.
The switch is on the brake pedal, just above it.
See the details and diagram below to get the exact procedure to replace brake light switch :-----
This details will help.
Thanks.
See below latest related solved problems :-----