If the hydraulic disc brakes are excessively noisy or rub to the point where they stop the wheel within one or two rotations after you stop pedaling, then they may need to be adjusted. We recommend waiting until after the wear-in period (50-100 miles) for your first adjustment unless the rubbing is severe.For brakes that squeal when coming to a stop, we recommend cleaning both sides of each rotor with isopropyl alcohol and a clean rag.