• 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.
  • 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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