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Brake booster vacuum question

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  • Brake booster vacuum question

    Hi. I owned a 1970 Oldsmobile Cutlass with a 455 motor. Prior owner modified the engine by replacing the stock intake with a performer's intake and a performer plus camshaft. This combination produces 15" of vacuum at idle. The issue is that I have always feel that the brake pedal was slightly hard and the brakes never really lock as for an emergency situation. I was used to this until a friend told me I needed a vacuum pump to increase vacuum to at least 18". He owns a 1971 Malibu with a big cam and had less than 15" of vacuum. Now with an electric pump manifold makes in excess of 18" Do I need a pump as well? I tested the booster and all works as expected. No leaks anywhere.

  • #2
    You need to get the booster fixed, or replaced. Some one changed some thing...most likely an accident, wrong parts were replaced.
    At 43,861 MPH Elon Musk now owns the fastest car in this Galaxy