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Home >> Nissan-Datsun >> 1989 >> Sentra Base >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc & Drum >> Testing >> Power Brake Unit Test >> Air Tight Check

Air Tight Check

  1. Start engine and run for 2 minutes. Turn engine off. Depress brake pedal several times. If brake pedal goes down further on first time, but slowly rises after that, go to next step. If not, check for air leak.
  2. Start engine. Depress brake pedal and turn engine off. Hold brake pedal down for 30 seconds. If there is no change in brake pedal height, power brake unit is air tight. If there is change, check for air leak.
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