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Home >> Ford >> 2004 >> Excursion 6.8 S, RWD >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Brake System - General Information -- Excursion & F250-F550 Super Duty >> Diagnosis And Testing >> Brake System >> Component Tests >> Accumulator, Hydro-Boost Only

Accumulator, Hydro-Boost Only

  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, replace the Hydro-Boost power brake booster and retest the system.
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