The maintenance of a mountain bike should be mostly preventive, making sure that everything is working well and nothing is about to break. u003cbru003eIf you are about to use your bike, you must check the brakes and suspension, tighten the fasteners and the adjusters, and well-lubricate the cables. If you are not going to use your bike for a long time you should disassemble it and store it in a dry, well-ventilated, and heated place.