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Since the caliper and rear brake pads work as both the regular brakes and the parking brake, it should never need adjusting once initially set up. Here are the instructions to set it up.
The following procedure is to be used only if a new parking brake control assembly is installed. All components of the parking brake system must be installed prior to the adjustment procedure. The parking brake control with automatic tensioning is preset by means of a shipping clip. The following procedure must be followed in sequence and must be done with the vehicle weight on the axle.
Verify removal of the shipping clip. The take-up reel will apply tension to the system.
Depress the parking brake control to the 8th notch.
Push the parking brake control pedal to release.
Check the parking brake function as follows:
Apply the parking brake with a full stroke, to the 9th or 10th notch.
Release the parking brake by shifting the vehicle into a forward gear with the engine running. The control must release.
Manually release the parking brake with the push-to-release feature.
With the control in the OFF position, the rear brakes must not drag. Check for movement of the rear cables from their conduits when the intermediate cable is deflected with a force of 10-15 lbs.