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Home >> Mazda >> 2002 >> 626 ES, Automatic >> Repair and Diagnosis >> Brakes >> Anti-Lock/Traction Control System >> Power Brake Unit Inspection >> Checking For Vacuum Loss
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Checking For Vacuum Loss

  1. Start the engine.
  2. Stop the engine when the vacuum gauge reading reaches 66.7 kPa {500 mmHg, 19.7 inHg}. 
  3. Observe the vacuum gauge for 15 seconds. 
    • If the gauge shows 63.3-66.7 kPa {475-500 mmHg, 18.7-19.7 inHg},  the unit is operating.
    • If a problem is found, inspect for damage on the check valve or vacuum hose, and examine the installation. Repair as necessary, and inspect it again.
  4. Start the engine.
  5. Depress the brake pedal with a force of 196 N {20 kgf, 44 lbf}. 
  6. With the brake pedal depressed, stop the engine when the vacuum gauge reading reaches 66.7 kPa {500 mmHg, 19.7 inHg}. 
  7. Observe the vacuum gauge for 15 seconds. 
    • If the gauge shows 66.3-66.7 kPa {475-500 mmHg, 18.7-19.7 inHg},  the unit is operating.
    • If a problem is found, inspect for damage on the check valve or vacuum hose, and examine the installation. Repair as necessary, and inspect it again.
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