Pinpoint Test B: The Parking Brake Will Not Release

Parking Brake






Pinpoint Tests

Pinpoint Test B: The Parking Brake Will Not Release

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:
- Front parking brake cable and conduit
- Intermediate parking brake cable and conduit
- Parking brake control
- Rear parking brake cable and conduit
- Rear brake calipers



PINPOINT TEST B: THE PARKING BRAKE WILL NOT RELEASE

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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 Parking Brake Control. TEST the system for normal operation.

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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 Parking Brake Cable - Rear. TEST the system for normal operation.

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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. TEST the system for normal operation.

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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 Parking Brake Cable - Intermediate. TEST the system for normal operation.

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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 Parking Brake Control. TEST the system for normal operation.

No
INSTALL a new front cable. TEST the system for normal operation.

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