Pinpoint Test B: The Parking Brake Will Not Release and/or Parking Brake Shoes Drag

Parking Brake

Pinpoint Tests

Pinpoint Test B: The Parking Brake Will Not Release and/or Parking Brake Shoes Drag

Normal Operation

When the parking brake release handle is pulled, the ratchet mechanism and return spring in the parking brake control release the tension on the parking brake cables and conduits. The springs on both rear cables provide the force necessary to return the parking brake shoes to their released position.

This pinpoint test is intended to diagnose the following:
- Parking brake control release handle
- Front parking brake cable and conduit
- Rear parking brake cable and conduit
- Parking brake shoes and hardware
- Parking brake control



PINPOINT TEST B: THE PARKING BRAKE WILL NOT RELEASE AND/OR PARKING BRAKE SHOES DRAG

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B1 CHECK THE PARKING BRAKE CONTROL RELEASE HANDLE AND CABLE


- Verify that the release handle and cable are connected to the parking brake control.
- Are the release handle and cable connected?

Yes
GO to B2.

No
CONNECT the handle and cable, then TEST the system for normal operation.

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B2 CHECK THE REAR PARKING BRAKE CABLES


- Disconnect the RH cable from the LH conduit equalizer, then disconnect the LH cable from the front cable.
- Release the rear parking brake cables from the bracket assembly.




- Release the rear parking brake cables from the parking brake actuating levers.
- 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 a new rear cable. REFER to Parking Brake Cable - LH Parking Brake Cable - LH or Parking Brake Cable - RH Parking Brake Cable - RH. TEST the system for normal operation.

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B3 CHECK THE REAR PARKING BRAKE SHOES AND HARDWARE


- Remove the rear brake disc, refer to Disc Brake System.
- Inspect the parking brake shoes, hardware and backing plate.
- Are the shoes, hardware and backing plate in good condition?

Yes
GO to B4.

No
INSTALL new components as necessary. TEST the system for normal operation.

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B4 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 Service and Repair. TEST the system for normal operation.

No
INSTALL a new front parking brake cable. REFER to Parking Brake Cable - Front Parking Brake Cable - Front. TEST the system for normal operation.

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