Replaceable, yes, but requires a full booster overhaul. You have to remove the booster and split it in half. It pulls out from the inside. Generally, a complete replacement valve is part of the rebuild kit. It takes a couple special tools to open the boosters. This stuff used to be done at the dealer level, which is why I used to teach this stuff. That all ended at some point in the late 80's, early 90's. Booster Dewey and a few other specialty shops do rebuild them. Sounds like your going to go modern anyway, so I would just not worry about the vacuum leak yet. See if the brakes function manually first, IMO.
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