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Vacuum Reservoir Test

  1. Locate vacuum reservoir on right or left fender apron, depending on model. Disconnect vacuum hose at servo. Connect vacuum gauge to hose. Start engine. Observe vacuum gauge reading.
  2. Vacuum should be at least 20 in. Hg. If vacuum is not within specification, check for leaking vacuum hose or faulty vacuum pump.
  3. Turn engine off after vacuum has stabilized at more than 20 in. Hg. Vacuum should hold steady. After 24 hours, vacuum should be a minimum of 15 in. Hg. If vacuum fails to hold, replace vacuum reservoir.
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