My old one did this. It did not mechanically center itself after turning. Not being centered would cause one or the other brake lights to not work. I installed some indicator lights under the dash wired to the brake lights so I could tell when the switch was centerd correctly. Replaced some of the old mechanical switch parts, cleaned and lubed the rest and everythings good now.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
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