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Home >> Subaru >> 2008 >> Outback Base, Automatic >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Brake System - Brakes - Mechanical >> Brake Booster >> Inspection >> Operation Check (With Gauges) >> Loaded Air Tightness Check

Loaded Air Tightness Check

  1. Start the engine and depress the brake pedal with pedal force of 196 N (20 kgf, 44 lb). Keep the 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: Loaded Air Tightness Check Connection Diagram
    G03833004Courtesy of SUBARU OF AMERICA, INC.
  2. Stop the 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 the engine, brake booster is functioning properly. If defective, refer to AIR TIGHTNESS CHECK  , INSPECTION, Brake Booster.>

  3. If any fault is found on brake booster, replace the brake booster with a new one.
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