My BB with the small supercharger has vacuum around 15 and the power brake booster is almost non-existent on the 8 inch double diaphragm booster.
I just purchased a modern GM vacuum pump and also a separate vacuum switch with hopes of improving my disc/drum braking.
The company selling the switch recommends a reservoir and a relay.
http://www.evwest.com/catalog/produc...roducts_id=290
Is there a minimum size the vacuum canister reservoir should be,
how do you compute the correct size?