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You only really need to adjust the shoes if you drive with the handbrake on, as it is only used while you are stationary, the shoes are not subject to wear like a disc pad. Because of the constant pulling on of the handbrake, the cable does stretch, so really, the only adjustment that should need to be done is the nut on the lever. This takes up the slack in the cable and ensures a firm application of the parkbrakes when you pull the lever up.