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Brake lights are'nt working. on 1993 Volvo 940

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Brake lights are'nt working. Checked fuses, stop light switch, wires, etc. all ok. All other lights work as well.
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(2) Comments
There is a bulb check relay in main fuse box, it's round and red. The brake light signal goes into that relay and comes out of it to the brake lights. Check the power in and power out when stepping on the brake pedal. I've seen these fail for just this reason, so that may be the issue.
Good Luck!