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Home >> Oldsmobile >> 2003 >> Aurora >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Disc Brake System) >> Testing >> Power Brake Unit >> Checking For Vacuum Loss (Loaded Condition)
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Checking For Vacuum Loss (Loaded Condition)

WARNING: This page is about a different car, the 2004 Mazda MX-5 Miata, 2003 Mazda MX-5 Miata, and 2002 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine.
  2. Depress the brake pedal with a force of 44 foot pounds (196 N.m).
  3. With the brake pedal held depressed, stop the engine when the vacuum gauge indicates 19.7 in. Hg. (66.7 kPa).
  4. Observe the vacuum gauge for 15 seconds. If the gauge indicates 18.8-19.6 in. Hg. (63.4-66.6 kPa), the unit is operating.
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