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Home >> Infiniti >> 2004 >> QX56 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 449 (Disc) >> Testing >> Power Brake Unit >> Air-Tight Check

Air-Tight Check

WARNING: This page is about a different car, the 2003 Infiniti QX4 and 2002 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine and let idle for 2 minutes. Shut engine off and depress brake pedal several times. If brake pedal height rises gradually on successive pedal depressions, go to next step. If pedal does not rise on successive pumps, check for air leak.
  2. Start engine. Depress brake pedal and turn engine off. Hold brake pedal down for 30 seconds. If brake pedal height does not change, power brake unit is air tight. If pedal height changes, check for air leak.
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