Pinpoint Test A: The Parking Brake Will Not Apply

Parking Brake

Pinpoint Tests

Pinpoint Test A: The Parking Brake Will Not Apply

Normal Operation

The parking brake system is cable-actuated and controlled by an independent, hand-operated parking brake control that is not self adjusting. The parking brake system is actuated when the parking brake control is pulled up. When the parking brake control is pulled, tension is applied to the front parking brake cable. This tension pulls on both rear parking brake cables, which are attached to the brake caliper parking brake actuators and apply the brake pads.

This pinpoint test is intended to diagnose the following:
- Parking brake control
- Parking brake cables
- Rear brake calipers



PINPOINT TEST A: THE PARKING BRAKE WILL NOT APPLY

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A1 CHECK THE PARKING BRAKE CONTROL


- Apply the parking brake control.
- Does the parking brake control move?

Yes
GO to A2.

No
GO to A3.

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A2 CHECK FOR BROKEN CABLES


- NOTE: Have an assistant apply and release the parking brake control 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
- Equalizer
- LH rear cable
- RH rear cable
- Rear brake caliper actuators
- Is any damage found or are any components disconnected?

Yes
CONNECT the component(s) or INSTALL a new parking brake component(s) as necessary. TEST the system for normal operation.

No
VERIFY that the rear pads are within thickness specifications. If the rear pads are OK, INSTALL new rear brake calipers.

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A3 ISOLATE THE PARKING BRAKE CONTROL AND FRONT PARKING BRAKE CABLE


- Remove the floor console rear access panel.




- Loosen the parking brake adjustment nut and disconnect the rear cables from the equalizer.
- Apply the parking brake control.
- Does the parking brake control move?

Yes
GO to A4.

No
INSTALL a new parking brake control. REFER to Parking Brake Control Service and Repair. TEST the system for normal operation.

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A4 ISOLATE THE REAR PARKING BRAKE CABLES


- Disconnect the LH and RH parking brake cables from 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. ADJUST the parking brake cable. REFER to Parking Brake Cable Adjustment Adjustments.

No
INSTALL a new rear brake cable(s). REFER to Parking Brake Cable - Rear Service and Repair. TEST the system for normal operation.

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