Power brake booster question...
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Joined: Jul 1999
Posts: 2,926
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From: Tucson, Arizona USA
Car: 1987 Z28 Convertible
Engine: 305 TPI
Transmission: 5-speed
Power brake booster question...
What is the minimum vacuum required to power one of these? Ever since I swapped cams, my power brake assist fades away under moderate brake pressure. I now produce 13 inches of vacuum at an idle and know of others who don't have this problem. Therefore, I'm leaning towards a bad booster. Does anyone know how to test this? Thanks for any insight, guys.
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Joined: Jul 1999
Posts: 17,271
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
13 inches is fine. Problems start when you get below 8".
Check the vacuum line to the booster. Make sure it's not leaking.
Check the vacuum line to the booster. Make sure it's not leaking.
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