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Old 04-25-2022, 08:44 PM   #66
MikeB
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Join Date: Jul 2000
Location: North Texas
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Re: 30% More Powerful-New 1/2T Power Brake Sys

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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Mike
1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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