To adjust hydraulic disc brakes on a bicycle, start by loosening the mounting bolts on the caliper to center it over the rotor. Then, squeeze the brake lever a few times to align the caliper properly. Next, tighten the mounting bolts and check for any rubbing or uneven braking. If needed, adjust the brake pads using the adjustment knobs on the caliper. Finally, test the brakes to ensure they are working smoothly and efficiently.
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