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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 581 (Brake System-General Information) >> Diagnosis And Testing >> Brake System >> Component Tests >> Brake Booster

Brake Booster

WARNING: This page is about a different car, the 2004 Ford RV Cutaway, 2004 Ford Econoline, 2004 Ford E450 Super Duty, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the engine OFF, apply the brake pedal several times to deplete the power assist reserve in the brake booster.
  2. Hold the brake pedal in the applied position.
  3. Start the engine.
  4. The brake pedal should drop slightly after the engine starts.
  5. On vacuum brake booster equipped vehicles, if the brake pedal does not drop after the engine is started, check for vacuum at the brake booster.
    • With the engine OFF, disconnect the vacuum hose and check valve at the brake booster.
    • Vacuum should be heard escaping from the brake booster.
  6. If vacuum is not available at the brake booster, check for vacuum at the source and check the vacuum hose for leaks.
    • On vehicles without a vacuum pump, check for vacuum at the engine. For additional information, refer to ENGINE SYSTEM-GENERAL INFORMATION .
    • On vacuum pump equipped vehicles, inspect the accessory drive and accessory drive belt. Refer to ACCESSORY DRIVE article.
  7. If vacuum is available at the brake booster and no power assist is felt, install a new brake booster and retest the system. For additional information, refer to DISC & DRUM .
  8. On Hydro-Boost® equipped vehicles, if the brake pedal does not drop after the engine is started, check the power steering pump pressure and flow. For additional information, refer to STEERING SYSTEM-GENERAL INFORMATION .
  9. If power steering pump pressure is available to the Hydro-Boost® and no power assist is felt, install a new Hydro-Boost® brake booster and retest the system. For additional information, refer to DISC & DRUM .

    ACCUMULATOR 

  10. Start and run the engine.
  11. Stop the engine.
  12. 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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