Description: Drill holes and grooves on the BMW Performance brake discs reduce the buildup of a film of water between the brake pad and the brake rotor when driving in wet weather conditions. Lower weight reduces unsprung mass and- as a result- improves driving dynamics. BMW Performance brake components are covered under the BMW Limited Warranty and the BMW Maintenance program. Perforated Rotor. 3.0L with turbo, with cross-drilled.