Reply to "Vacuum pump for power brake booster"

Years ago I was working on a compressor product for instrumentation where excessive noise was an issue. I found that a good inlet muffler and good vibration isolation is key to noise suppression. Putting the pump into an isolation box works well but often not practical. There are many inlet noise suppressors available to choose from and they aren’t very expensive. I suggest using a short piece of vacuum rated rubber hose between the pump and suppressor. Vacuum rated hose shouldn’t be necessary but we are taking about the brake system. The unit should be rated for -dB attenuation. Pump inlets and outlets are like small horn speakers.