what would cause the break lights not to work in v.w on 1990 Volkswagen Golf

what would cause the break lights not to work or come on even though fuses have been replaced and no burnt out blubs

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2 answers
Failed brake light switch or broken wire in circuit?
if you have ck'd bulbs ck brake light switch, pwr should be in one side then depress pedal and pwr should be at other side also