Pinpoint Test B: The Parking Brake Will Not Release

B1 CHECK THE PARKING BRAKE CONTROL
- With the rear wheels raised off the ground, fully apply the parking brake.
- Release the parking brake.
- Did the parking brake release?
  - Yes : CHECK for other causes such as conventional brake system components. REPAIR or INSTALL new components as necessary. REFER to BRAKE SYSTEM-GENERAL INFORMATION . TEST the system for normal operation.
  - No : GO to B2.
B2 CHECK THE PARKING BRAKE CABLES
- Loosen the parking brake cable tension.
- Rotate the rear wheels by hand.
- Did the rear wheels turn freely?
  - Yes : INSTALL a new parking brake control. REFER to PARKING BRAKE CONTROL . TEST the system for normal operation.
  - No : GO to B3.
B3 CHECK THE FRONT PARKING BRAKE CABLE
- Disconnect the front parking brake cable from the rear parking brake cable at the equalizer.
- Rotate the rear wheels by hand.
- Did the rear wheels turn freely?
  - Yes : INSTALL a new front parking brake cable. REFER to PARKING BRAKE CABLE . TEST the system for normal operation.
  - No : GO to B4.
B4 CHECK THE REAR PARKING BRAKE CABLES
- Disconnect the rear parking brake cable at the rear brakes, one at a time.
- Rotate the wheel affected by the disconnected parking brake cable.
- Did the wheel turn freely?
  - Yes : INSTALL a new rear parking brake cable. REFER to PARKING BRAKE CABLE . TEST the system for normal operation.
  - No : CHECK for other causes in the conventional brake system components. REPAIR or INSTALL new components as necessary. REFER to BRAKE SYSTEM-GENERAL INFORMATION . TEST the system for normal operation.