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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Disc Brake System & Drum Brake System) >> Component Tests >> Power Brake Unit

Power Brake Unit

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Mazda B4000, 2004 Mazda B3000, 2004 Mazda B2300, 2003 Mazda B4000, and 2003 Mazda B3000. However, it is still accessible from the selected car via links, so may be relevant.
  1. With engine off, depress brake pedal several times. Press and hold brake pedal and start engine. If brake pedal moves down slightly immediately after engine starts, power brake unit is operating. If brake pedal does not move as specified, go to next step.
  2. Remove vacuum hose from check valve connection. Manifold vacuum must be present at check valve end of hose with engine at idle speed. Repair as necessary, and go to next step.
  3. Start engine and run at fast idle for at least 10 seconds. Stop engine and let vehicle stand for 10 minutes. Brake pedal feel should be the same as that noted with engine operating. If pedal feels hard, replace check valve and retest.
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