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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Anti-Lock Brake System - Vehicle Dynamic Systems) >> Diagnostic Tests >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test F: Spongy/Soft/Low Brake Pedal with No Warning Indicator >> Pinpoint Test F: Spongy/Soft/Low Brake Pedal With No Warning Indicator

Pinpoint Test F: Spongy/Soft/Low Brake Pedal With No Warning Indicator

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
  1. F1 CHECK THE BASE BRAKE COMPONENTS 
    • Visually inspect the brake hoses and tubes from the HCU to the brake calipers.
    • Visually inspect the calipers and brake components.
    • Are any of these components damaged or leaking? 
    1. YES  : REPAIR or INSTALL new components as necessary. TEST the system for normal operation.
    2. NO  : Go to  F2.
  2. F2 CHECK FOR A LEAKING DUMP VALVE 
    • Key in OFF position.
      • Fig 1: Locating Rubber Boots From 2 HCU Low Pressure Accumulators
      GF0015401Courtesy of FORD MOTOR CO.
    • Remove the rubber boots from the 2 HCU low pressure accumulators and insert a clean steel implement (such as a paper clip or a small screwdriver) into each low pressure accumulator.
    • Key in ON 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 condition.
    • Have an assistant press hard on the brake pedal while observing the steel implements.
    • Do either of the implements move out 6.35 mm (0.25 in) or more? 
    1. YES  : INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) .
    2. NO  : REMOVE the steel implements. INSTALL the rubber boots on each low pressure accumulator. REFER to BRAKE SYSTEM - GENERAL INFORMATION to continue diagnosis of the base brake system.
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