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Loaded Air Tightness (With Gauges)

  1. Start engine and depress the brake pedal with pedal force of 44 lbs. (196 N). Keep engine running until a vacuum of 19.69 in Hg. (66.7 kPa) is indicated on vacuum gauge while the pedal is still depressed.
  2. Stop engine and watch vacuum gauge. If vacuum drop range is less than 0.98 in Hg. (3.3 kPa) within 15 seconds after stopping engine, brake booster is functioning properly. If defective, see AIR TIGHTNESS (WITH GAUGES)  .
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