Adjustment of the parking brake should be done only:

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Parking brake adjustment should follow confirming the service brakes are in proper working order. The parking brake is a secondary hold that relies on the rear brake components; if the service brakes are worn or not functioning correctly, adjusting the parking brake won’t guarantee safe operation and can mask a problem with the primary braking system. By first checking the service brakes—inspecting for wear, leaks, and proper hydraulic or mechanical function—you ensure the primary system is sound. Then you adjust the parking brake so its engagement point matches the correct cable tension and lever travel, as specified for the vehicle. This sequence prevents masking issues and ensures the parking brake will hold reliably only when the service brakes are up to spec.