Parking Brake System and Actuation Ford Taurus X I

Material

Material

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

The parking brake system consists of the following components

1. Intermediate parking brake cable
2. Parking brake control
3. Rear parking brake cables

The parking brake system is a mechanical system that activates a self-adjusting brake ratchet system within the rear brake caliper.

The parking brake system is cable-actuated and controlled by an independent foot-operated parking brake control. The parking brake system is actuated when the parking brake control is pressed and released by pressing the parking brake control a second time. The parking brake control applies tension to rear parking brake shoes through the front parking brake cable and conduit and the LH and RH rear parking brake cables. The respective rear parking brake assemblies are then applied.

The parking brake cable tension is self-adjusting inside the parking brake control.

Material

Principles of Operation

Parking Brake System - When the parking brake control is pressed, tension is applied to the intermediate parking brake cable. This tension pulls on the RH rear parking brake cable, which is attached to the RH rear parking brake actuator and applies the RH rear brake caliper. At the same time, the tension in the intermediate cable causes the intermediate cable conduit to attempt to straighten out. This straightening effect causes tension that pulls the LH rear cable which is attached to the LH rear parking brake actuator and applies the LH rear brake caliper.

Inspection and Verification

Check the operation of the parking brake system with the vehicle on a hoist and the parking brake control fully released. Check for any damaged cables and install new components as necessary.

The first indication that something may be wrong in the parking brake system is a change in the feeling through the parking brake control. The parking brake not holding on an incline or dragging after being released are also indicators of system concerns.

1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical damage. VISUAL INSPECTION CHART Mechanical Electrical Parking brake control Intermediate parking brake cable and conduit LH rear parking brake cable and conduit Rear brake calipers RH rear parking brake cable and conduit Wiring, terminals and connectors Parking brake switch
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, verify the symptom and Go to «Symptom Chart»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) .

Symptom Chart

Symptom Chart

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 is fully applied. When the parking brake control is pressed, tension is applied to the intermediate parking brake cable. This tension pulls on the RH rear parking brake cable, which is attached to the RH rear parking brake actuator, and applies the RH rear brake caliper. At the same time, the tension in the intermediate cable causes the intermediate cable conduit to attempt to straighten out. This straightening effect causes tension that pulls the LH rear cable, which is attached to the LH rear parking brake actuator, and applies the LH rear brake caliper.

This pinpoint test is intended to diagnose the following

1. Front parking brake cable and conduit
2. Intermediate parking brake cable and conduit
3. Parking brake control
4. Rear parking brake cables and conduits
5. Rear brake calipers

Scheme 1

1. A1 CHECK THE PARKING BRAKE CONTROL Press the parking brake control pedal. Does the parking brake control move? YES : Go to A2 . NO : Go to A3 .
2. A2 CHECK FOR BROKEN CABLES NOTE: Have an assistant press and release the parking brake pedal to help isolate disconnected cables or cables that do not move. Inspect the following items for damage and correct connections: Parking brake control Front cable Intermediate cable LH rear cable RH rear cable Cable equalizers Rear brake caliper actuators Is any damage found or are any components disconnected? YES : CONNECT the component(s) or INSTALL new parking brake component(s) as necessary. TEST the system for normal operation. NO : VERIFY that the rear pads are within thickness specifications. REFER to Specifications in «BRAKE SYSTEM - GENERAL INFORMATION»(/ford/taurus-x/i-2007-2009/remont/anti-locktraction-control/#brake-system-general-information) article. If the rear pads are OK, INSTALL new rear brake calipers. REFER to «REAR DISC BRAKE»(/ford/taurus-x/i-2007-2009/remont/mechanical-hydraulic/#rear-disc-brake-system) article.
3. A3 ISOLATE THE PARKING BRAKE CONTROL AND FRONT PARKING BRAKE CABLE Disconnect the front cable from the intermediate cable at the cable union. Press the parking brake control pedal. Does the parking brake control pedal move? YES : Go to A4 . NO : Go to A6 .
4. A4 ISOLATE THE INTERMEDIATE PARKING BRAKE CABLE Disconnect the LH and RH cables from the intermediate cable equalizer. While holding the intermediate cable conduit, attempt to slide the intermediate cable inside the conduit. Does the cable slide freely inside the conduit? YES : Go to A5 . NO : INSTALL a new intermediate cable. REFER to «Parking Brake Cable - Intermediate»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) . TEST the system for normal operation.
5. A5 ISOLATE THE REAR PARKING BRAKE CABLES Disconnect the LH and RH parking brake cables from the subframe brackets and the brake calipers. While holding the cable conduit, attempt to slide the cable inside the conduit. Does the cable slide freely inside the conduit? YES : INSTALL new rear brake calipers. REFER to «REAR DISC BRAKE»(/ford/taurus-x/i-2007-2009/remont/mechanical-hydraulic/#rear-disc-brake-system) article. NO : INSTALL new rear brake cable(s). REFER to «Parking Brake Cable - Rear»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) . TEST the system for normal operation.
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? YES : INSTALL a new parking brake control. Refer to «Parking Brake Control»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) . TEST the system for normal operation. NO : INSTALL a new front parking brake cable. TEST the system for normal operation.

When the parking brake control is fully applied and the pedal is pressed a second time, the ratchet mechanism in the parking brake control releases the tension on the parking brake cables and conduits. The springs on both rear brake calipers provide the force necessary to return the brake pads and cables to their released position.

This pinpoint test is intended to diagnose the following

1. Front parking brake cable and conduit
2. Intermediate parking brake cable and conduit
3. Parking brake control
4. Rear parking brake cable and conduit
5. Rear brake calipers

PINPOINT TEST B: THE PARKING BRAKE WILL NOT RELEASE

1. B1 CHECK THE PARKING BRAKE CONTROL Press the parking brake control pedal. Does the parking brake control move? YES : Go to B2 . NO : INSTALL a new parking brake control. REFER to «Parking Brake Control»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) . TEST the system for normal operation.
2. B2 CHECK THE REAR PARKING BRAKE CABLES Disconnect the LH and RH cables from the intermediate cable equalizer. Disconnect the LH and RH parking brake cables from the subframe brackets and the brake calipers. While holding the rear cable conduit, attempt to slide the rear cable inside the conduit. Does the cable slide freely inside the conduit? YES : Go to B3 . NO : INSTALL new rear brake cable(s). REFER to «Parking Brake Cable - Rear»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) . TEST the system for normal operation.
3. B3 CHECK THE REAR BRAKE CALIPERS AND HARDWARE Inspect the brake calipers, actuators and return springs. Are the components in good condition? YES : Go to B4 . NO : INSTALL new components as necessary. REFER to «REAR DISC BRAKE»(/ford/taurus-x/i-2007-2009/remont/mechanical-hydraulic/#rear-disc-brake-system) article. TEST the system for normal operation.
4. B4 ISOLATE THE INTERMEDIATE PARKING BRAKE CABLE Disconnect the intermediate cable from the front cable at the cable union. While holding the intermediate cable conduit, attempt to slide the intermediate cable inside the conduit. Does the cable slide freely inside the conduit? YES : Go to B5 . NO : INSTALL new intermediate cable. REFER to «Parking Brake Cable - Intermediate»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) . TEST the system for normal operation.
5. B5 ISOLATE THE FRONT PARKING BRAKE CABLE Press the retaining tabs and disconnect the front parking brake conduit from the parking brake control bracket. Push the front parking brake conduit grommet through the body. Verify that the front cable conduit can slide freely on the cable. Does the conduit slide freely on the cable? YES : INSTALL a new parking brake control. REFER to «Parking Brake Control»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) . TEST the system for normal operation. NO : INSTALL a new front cable. TEST the system for normal operation.

Tension Release

1. Remove the LH A-pillar lower trim panel.
2. With an assistant, release the parking brake cable tension by pulling down on the intermediate cable at the cable-to-cable union until the parking brake control sector rotates to its stop and a 4 mm (0.15 in) x 150 mm (5.9 in) retainer pin can be inserted.
3. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING AND LIFTING»(/ford/taurus-x/i-2007-2009/remont/hoistjack/#jacking-and-lifting) article.
4. Disconnect the cable at the cable-to-cable union.

Scheme 2

1. For additional information, refer to the procedures in this article.

REMOVAL AND INSTALLATION

1. Relieve the parking brake cable tension. For additional information, refer to «Parking Brake Cable Tension Release»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) .
2. Remove the 3 parking brake cable bracket bolts from the subframe. To install, tighten to 12 Nm (9 lb-ft).
3. Disconnect the intermediate cable from the front cable at the cable-to-cable union.
4. Release the intermediate cable from the body bracket.
5. Release the intermediate cable from the rear RH cable at the cable-to-cable union.
6. Release the LH rear cable from the intermediate cable at the conduit equalizer.
7. To install, reverse the removal procedure. Inspect the parking brake system for correct operation.

1. Relieve the parking brake cable tension. For additional information, refer to «Parking Brake Cable Tension Release»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) .
2. If removing the RH cable, release the intermediate cable from the rear cable-to-cable union.
3. If removing the LH cable, disconnect the cable from the intermediate cable at the equalizer.
4. Release the parking brake cable from the brake caliper.
5. Release the rear cable conduit from the rear subframe bracket.
6. Remove the upper control arm parking brake cable bracket nut. To install, tighten to 37 Nm (27 lb-ft).
7. To install, reverse the removal procedure. Inspect the parking brake system for correct operation.

Scheme 3

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING AND LIFTING»(/ford/taurus-x/i-2007-2009/remont/hoistjack/#jacking-and-lifting) article.
2. Release the tension on the parking brake cable. For additional information, refer to «Parking Brake Cable Tension Release»(/ford/taurus-x/i-2007-2009/remont/parking-brake-system/#parking-brake-system-and-actuation) .
3. Remove the smart junction box (SJB) and bracket. For additional information, refer to «MULTIFUNCTION ELECTRONIC MODULES»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#multifunction-electronic-modules-system) article.
4. Disconnect the parking brake switch electrical connector.
5. Remove the nut and 2 bolts from the parking brake control. To install, tighten to 30 Nm (22 lb-ft).
6. Position the carpet aside and position the cable conduit grommet through the floor.
7. Remove the parking brake control from the vehicle.
8. To install, reverse the removal procedure. Inspect the parking brake system for correct operation.

See also:
• BRAKE SYSTEM - GENERAL INFORMATION
• REAR DISC BRAKE
• JACKING AND LIFTING
• MULTIFUNCTION ELECTRONIC MODULES
• Symptom Chart
• Pinpoint Test B