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will it just lock the front or just the rear brakes ?
the odds are the booster rod is a bit too long keeping the front brakes locked
was the booster rod adjustable at all ?
it could very well be
but if it was NOT doing this before the booster was replaced then the booster is defective of the master is bad
usually most people will slide the master cylinder off and add 2 flat washers to the booster studs then see if the problem goes away it it doesn't the master is bad if it does go away leave the washers or swap out another booster
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the shim will not hurt anything
without your foot on the brake the booster should not be pushing the master at all and if you unplug the vacuum hose and the brakes release then the rod is too long or the booster is defective
no the vacuum is sealed inside the booster nothing will leak
if you shim it and it stops doing this then the booster is the issue
i have had issues with GM Dodge and Ford aftermarket or remand boosters and went to using OEM boosters and these problems went away