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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 410 (Conventional Brake System) >> Power Brake Unit Inspection >> Power Brake Unit Function Check (Inspection Using The Testers) >> Checking for vacuum loss (loaded condition)

Checking for vacuum loss (loaded condition)

WARNING: This page is about a different car, the 2005 Mazda MPV. 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 200 N {20 kgf, 44 lbf}  .
  3. With the brake pedal depressed, stop the engine when the vacuum gauge reading reaches 66.7 kPa {500 mmHg, 19.7 inHg}. 
  4. Observe the vacuum gauge for 15 seconds. 
    • If the gauge shows 63.3-66.7 kPa {475-500 mmHg, 18.7-19.6 inHg}  , the unit is operating.
    • If not, inspect for damage on the check valve or vacuum hose, and examine the installation. Repair if necessary, and inspect it again.
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