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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Disc Brakes) >> Diagnosis & Testing >> Power Brake Unit >> Air-Tight Check

Air-Tight Check

WARNING: This page is about a different car, the 2004 Nissan Altima, 2003 Nissan Altima, and 2002 Nissan Altima. 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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