What would cause the brake pedal of a 1974 Nova not to return to the original position to turn off the brake lights when engine at a low rpm? The pedal returns to proper position to turn off the brake lights when the rpm is higher.
by 
flmgpnk
ANSWERS: 2
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This is probably caused by a fault in the servo, maybe just a leak in the vacuum pipe from the manifold. You need to get it checked by a mechanic. Incidentally, you don't say whether you're in USA (so you're talking about a Chevy Nova) or UK (so it's a Vauxhall Nova). It doesn't matter in this case, but often it would help if people would say where they are.
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It sounds like your brake power booster isn't holding up. You probably have to either rebuild or get a new one. Good luck.
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