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Pinpoint Test H: Testing

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 CHECK THE BASE BRAKE COMPONENTS 
    • Visually inspect the brake lines from hydraulic control unit (HCU) to brake calipers.
    • Visually inspect the calipers and brake components.
    • Are any of these components damaged? 
    • Yes  : REPAIR or INSTALL new components as necessary. TEST the system for normal operation.
    • No  : GO to H2.
  2. H2 CHECK FOR A LEAKING DUMP VALVE 
    • Key in OFF position.
    • Remove the rubber boots from the 2 HCU low pressure accumulators (LPA).
      Fig 1: Removing Rubber Boots From 2 HCU Low Pressure Accumulators (LPA)
      G03924218Courtesy of FORD MOTOR CO.
    • Insert a clean steel implement (e.g., paper clip or small screwdriver) into each LPA.
      Fig 2: Inserting Clean Steel Implement Into Each LPA
      G03924218Courtesy of FORD MOTOR CO.
    • Key in START position.
      • NOTE: A leaking dump valve is similar to the master cylinder bypass condition. It is important that the pedal be quickly and forcefully applied to rule out master cylinder bypass as a cause. Typically, master cylinder bypass occurs only at low pedal pressure rates.
    • Have an assistant press hard on the brake pedal while observing the steel implements.
    • Do any of the implements move out 6.35 mm (0.25 in) or more? 
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