L31MaxExpress
I'm Awesome
Gone up a few bucks, but this is how you get around low idle vacuum, tie this to a relay that gets a signal from the brake light switch. When you are on the brakes, the pump runs. I use a 3/8 check valve between the engine and a T-this off the 2nd leg of the T and the 3rd leg of the T goes into the OEM check valve on the booster. If the pump were to fail you would atleast get some assist on the booster from the engine. Hella claims they are not exaclty meant as a stand alone brake vacuum pump but they work very well setup as I mentioned. It is more of a secondary supply to create more vacuum than the engine alone can when setup the way I mentioned. Engine pulls what it can, then the vacuum pump pulls the rest, sealing off the vacuum line to the engine via the check valve.
ACDelco 20939309 ACDelco GM Genuine Parts Power Brake Booster Vacuum Pumps | Summit Racing
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