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Vacuum Booster Check (Cis Fuel-Injected Models Only)

  1. An adjustable or non-adjustable vacuum booster is installed to increase vacuum to power brake unit. To check booster, warm engine until oil reaches 140°F.
  2. Install "T" connector between distributor vacuum unit and intake manifold. Gauge should read 7.4 in. Hg vacuum with engine idling. If not, check vacuum lines for leaks.
  3. If vacuum is as specified in step 2), check booster as follows: Remove and plug hose from right side of booster. Loosen lock nut (if equipped), and install vacuum gauge and hose.
  4. Gauge should read 11.8 in. Hg vacuum with engine idling. Adjust screw in or out to obtain correct reading (if equipped). Replace defective booster.
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