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Home >> Nissan-Datsun >> 2003 >> Sentra SE-R, Automatic >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Disc Brakes & Drum Brakes >> Testing >> Power Brake Unit >> Air-Tight Check

Air-Tight Check

  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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