This process gives you the confidence needed as a driver that you can handle whatever situation might come your way. List of the cons of drilled and slotted rotors. Are Slotted Or Drilled Brake Rotors Actually Better If drilled and/or slotted rotors are worthless ,why do car companies, race teams ect still defy all your “uhmmm wisdom”? Do drilled and slotted rotors make a difference . The advantages from cross drilled and slotted rotors comes during extremely hard and repetitive braking such as in competition use. The drilled only and slotted only rotors tend to have significant differences, which are combined in the drilled and slotted rotors to help boost their functionality significantly. The drilled the only rotor has been designed to allow air ventilate via a series of holes that allow water, steam, and debris escape; On the top side of the rotor, follow up along the slot. Drilled and slotted rotors offer drivers the consistent performance they want without changing t...