Impreza 2.5 RS Sedan AWD F4-2.5L SOHC (2002)
1) Start the engine and depress the brake pedal with pedal force of 196 N (20 kgf-m, 44 lb.). Keep the engine running until a vacuum of 66.7 kPa
(500 mm Hg, 19.69 in Hg) = point B is indicated on vacuum gauge while the pedal is still depressed.
2) Stop the engine and watch vacuum gauge. If the vacuum drop range is less than 3.3 kPa (25 mm Hg, 0.98 in Hg) within 15 seconds after
stopping the engine, brake booster is functioning properly. If defective, refer to "AIR TIGHTNESS CHECK".
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Lack of boosting action check
Turn off the engine, and set the vacuum gauge reading at "0". Then, check the fluid pressure when brake pedal is depressed. The pressure must be
greater than the standard value listed.
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Boosting action check
Set the vacuum gauge reading at 66.7 kPa (500 mm Hg, 19.69 in Hg) by running engine. Then, check the fluid pressure when brake pedal is
depressed. The pressure must be greater than the standard value listed.
