This is how you adjust the brake cable to your preferred strength.
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1. On the brake handle, you must loosen the adjustment screw so that it is completely loose (see picture below)

2. Unscrew the adjusting screw on the rear brake cable that sits with the brake caliper

3. Unscrew the screw holding the wire, then pull the wire down to tighten. When the cable is taut, all screws and adjustment screws must be tightened to your liking 👍