If you modded your car with a bigger engine or more aggressive cam you may find your break vacuum has been diminished - mine dropped to as low as 9" (or Hg). Typical should be 17-22Hg - so I am installing a brake vacuum pump which will get my vacuum back up to 20.
Vacuum Pump
Ebay:
Brake Booster Vacuum Pump -Ultra quiet Rotary Vacuum pump 12 V
www.ebay.com/itm/224085196542
3-Way Check Valve
Amazon:
ACDelco GM Original Equipment 20791947 Power Brake Booster Vacuum Check Valve
www.amazon.com/dp/B004JBB09Q
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