Join Date: Dec 2000
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Re: OT Power Brakes
this sounds similar to a problem i having with a dual diaphram booster out of a Astro van that i swapped into my cj-8.
my situation: the pedal is very difficult to get started moving. once i get the pedal past the first 1/4" of travel, the brakes work so well they almost lock up the tires. i tried swapping MC's, looked for binding linkage, and checked for a stuck caliper or wheel cylinder. so far, i have narrowed it down to the booster. i know there is a little check-valve in the vacuum line, but don't really know if this is the problem. my vacuum source is the intake manifold on the AMC 360.
any ideas would be greatly appreciated!