Help...deuce master/ booster disassembly

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Haven't messed with any of that model but there's a good chance that it has some tabs on it somewhere that were "pinched" onto a corresponding raised spot on the "valve body".

Get an inspection mirror and see if it's attached to the underside of the block/body...can't see the whole piece in your pics.

EDIT AND ADD: Looking at your first pic....does that bracket run all the way up to the area where the steel brake line/fitting is attached to the "valve body"???