Quote:
Originally Posted by MikeB
MP Brakes says you need 18" minimum idle vacuum, but I think that's conservative. That number will vary with caliper and pad type, as well as booster area and vehicle weight.
The kit listed in this thread uses two 9" boosters, which is a lot of diaphragm area! So I'd say 16"-18" should be fine, assuming your calipers, pads, rotors, drums, shoes and hoses are in good shape. Otherwise it's like installing a performance cam and a new carb on a worn-out engine.
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thank you Mikeb much appreciated