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Unbolt master cylinder ( no need to disconnect brake fluid lines ) Here is the hard part. Contort yourself ,so you are able to get under the L/S dash below steering column, remove ( 4 ) nuts from 4 studs securing the brake booster to the firewall. Then reve the booster from under the hood

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Q: How do you change the vacuum booster on a 1992 cadillac deville?
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