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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 627 (Brake System - General Information -- F250-F550 Super Duty) >> Diagnosis And Testing >> Brake System >> Brake Booster >> Notes

Brake Booster: Notes

WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the transmission in NEUTRAL and the engine stopped, apply the brakes several times to exhaust the vacuum in the vacuum boost system or the pressure in the Hydro-Boost® system.
  2. Hold the brake pedal in the applied position.
  3. Start the engine.
  4. If the power brake system is functioning correctly, the brake pedal can be felt to move downward after the engine starts.
  5. With a vacuum type power brake booster, if engine vacuum is available to the power brake booster and no power assist is felt, install a new power brake booster and retest the system.

If power steering pump pressure is available to the Hydro-Boost® power brake booster and no power assist is felt, install a new Hydro-Boost® power brake booster and retest the system.

If power steering pump pressure is not available at the Hydro-Boost® power brake booster, check the power steering pump pressure and flow. For additional information, refer to STEERING SYSTEM-GENERAL INFORMATION .

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