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Loaded air tightness check

  1. Start engine and depress brake pedal with pedal force of 196 N (20 kgf, 44 lb). Keep engine running until a vacuum of 66.7 kPa (500 mmHg, 19.69 inHg) = point B is indicated on vacuum gauge while the pedal is still depressed.
    Fig 1: Checking Loaded Air Tightness
    G03751836Courtesy of SUBARU OF AMERICA, INC.
  2. Stop engine and watch vacuum gauge.

    If the vacuum drop range is less than 3.3 kPa (25 mmHg, 0.98 inHg) within 15 seconds after stopping engine, brake booster is functioning properly.

    If defective, refer to "AIR TIGHTNESS CHECK ".

    < Ref. to , INSPECTION , Brake Boosters. >

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