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Pinpoint Test A: The Parking Brake Does Not Apply

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation 

When the parking brake control pedal is pressed the pedal should move a short distance, with more pressure needed to apply the pedal as it gets closer to the floor, until the parking brake shoes are fully applied. When the pedal is pressed, tension is applied to the front parking brake cable. This tension pulls on the LH rear parking brake cable, which is attached to the LH rear parking brake shoe actuator and applies the LH rear brake shoes. At the same time, the tension in the LH rear cable causes the LH rear cable conduit to attempt to straighten out. This straightening effect causes the LH rear cable conduit to pull on the RH rear parking brake cable, which is attached to the RH rear parking brake shoe actuator and applies the RH rear brake shoes.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST A: THE PARKING BRAKE DOES NOT APPLY 

  1. A1 CHECK THE PARKING BRAKE CONTROL 
    • Press the parking brake control pedal.
    • Does the parking brake control move? 
    1. YES  : Go to  A2.
    2. NO  : Go to  A4.
  2. A2 CHECK FOR BROKEN CABLES 
      WARNING: Before servicing a vehicle equipped with a fire suppression system, depower the system by following the procedure in FIRE SUPPRESSION SYSTEM article. Failure to follow the instructions may result in serious personal injury.
    • With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING article.
      • NOTE: Have an assistant press and release the parking brake pedal to help isolate disconnected cables or cables that do not move.
    • Inspect the front cable, both rear cables, cable equalizers and parking brake shoe or brake shoe actuators for damage and correct connections.
    • Is any damaged found or are any cables disconnected? 
    1. YES  : CONNECT the cable(s) or INSTALL new parking brake component(s) as necessary. TEST the system for normal operation. If equipped with a fire suppression system, go to  A7.
    2. NO  : Go to  A3.
  3. A3 CHECK THE PARKING BRAKE SHOES AND HARDWARE 
    • Remove the rear brake disc, refer to REAR DISC BRAKE article. Inspect the parking brake shoes and hardware for damage and/or missing components.
    • Is any damage found or are any components missing? 
    1. YES  : INSTALL new components as necessary. TEST the system for normal operation. If equipped with a fire suppression system, go to  A7.
    2. NO  : INSTALL a new parking brake control. REFER to PARKING BRAKE CONTROL . TEST the system for normal operation. If equipped with a fire suppression system, go to  A7.
  4. A4 ISOLATE THE PARKING BRAKE CONTROL AND FRONT PARKING BRAKE CABLE 
      Fig 1: Connector Between Front Parking Brake Cable & Rear Parking Brake Cable
      GF0014000Courtesy of FORD MOTOR CO.
    • Disconnect the front parking brake cable from the LH rear parking brake cable.
    • Press the parking brake control pedal.
    • Does the parking brake control pedal move? 
    1. YES  : Go to  A5.
    2. NO  : Go to  A6.
  5. A5 ISOLATE THE REAR PARKING BRAKE CABLES 
    • Disconnect the rear parking brake cables from the brake shoe actuator cables.
    • While holding the cable conduit, attempt to slide the cable inside the conduit.
    • Does the cable slide freely inside the conduit? 
    1. YES  : INSPECT the parking brake shoes, hardware and backing plate. INSTALL new components as necessary. REFER to PARKING BRAKE SHOES . TEST the system for normal operation. If equipped with a fire suppression system, go to  A7.
    2. NO  : INSTALL new rear brake cable(s). REFER to PARKING BRAKE CABLE - REAR . TEST the system for normal operation. If equipped with a fire suppression system, go to  A7.
  6. A6 ISOLATE THE FRONT PARKING BRAKE CABLE 
    • Disconnect the front parking brake cable and conduit from the parking brake control.
    • While holding the cable conduit, attempt to slide the cable inside the conduit.
    • Does the cable slide freely inside the conduit? 
    1. YES  : INSTALL a new parking brake control. Refer to PARKING BRAKE CONTROL . TEST the system for normal operation. If equipped with a fire suppression system, go to  A7.
    2. NO  : INSTALL a new front parking brake cable. REFER to PARKING BRAKE CABLE - FRONT . TEST the system for normal operation. If equipped with a fire suppression system, Go to  A7.
  7. A7 REPOWER THE FIRE SUPPRESSION SYSTEM 
      WARNING: Before servicing a vehicle equipped with a fire suppression system, depower the system by following the procedure in FIRE SUPPRESSION SYSTEM article. Failure to follow the instructions may result in serious personal injury.
    • Verify that the fire suppression system is repowered. Refer to FIRE SUPPRESSION SYSTEM article.
    • Is the fire suppression system repowered? 
    1. YES  : Fire suppression system repowering is complete.
    2. NO  : REFER to FIRE SUPPRESSION SYSTEM article for fire suppression system depowering and repowering procedure.
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