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Leak Test

  1. Depress brake pedal with engine running. Hold brake pedal in depressed position, and turn ignition off. If pedal height does not vary within 30 seconds, vacuum booster is okay. If pedal height changes, check for air leaks.
  2. With engine stopped, depress brake pedal several times using normal pressure. Pedal height should be low when first depressed. On consecutive applications, pedal height should gradually increase. If pedal height does not increase, check for air leaks.
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