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Home >> Subaru >> 2003 >> Impreza RS, Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc & Drum >> Testing >> Brake Booster >> Lack Of Boosting Action (With Gauges)

Lack Of Boosting Action (With Gauges)

Turn off engine, and set vacuum gauge reading to "0". Then, check fluid pressure when brake pedal is depressed. Pressure must be greater than the standard value. See FLUID PRESSURE SPECIFICATION  table.

LACK OF BOOSTING ACTION FLUID PRESSURE SPECIFICATIONS

Application Psi (kPa)
Non-Turbo Charged
With Brake Pedal Force At 33 lbs. (147 N) 85 (588)
With Brake Pedal Force At 66 lbs. (294 N) 213 (1471)
Turbo Charged
Automatic Transmission
With Brake Pedal Force At 33 lbs. (147 N) 100 (686)
With Brake Pedal Force At 66 lbs. (294 N) 242 (1667)
Manual Transmission
With Brake Pedal Force At 33 lbs. (147 N) 85 (588)
With Brake Pedal Force At 66 lbs. (294 N) 213 (1471)