Having problems with your 1984 Oldsmobile Delta 88 ?
Press pedel makes air swishing sound but no power brake pressure
The power brake booster, is not holding vacuum, that's the hissing noise you hear, and that's why you don't have power brake's, the only fix is replacing the booster.
Repair Help & Product Troubleshooting for 1984 Oldsmobile Delta 88
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