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Power Brake Booster Function Test (Vacuum, Hydro-Boost & Hydro-Max): Accumulator

  1. Start and run the engine.
  2. Stop the engine.
  3. Apply the brakes. The accumulator in the Hydro-Boost power brake booster should retain enough pressure for at least two power-assisted brake operations. If no power assist is felt, install a new Hydro-Boost power brake booster and retest the system.
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