ACDelco OES Brake RotorsACDelco OES Brake Rotors are engineered to Original Equipment design criteria and manufactured to the demanding TS 16949 quality standard in QS9000 rated facility.A focus on high quality casting materials, tight machining tolerances and key design features, ensure that ACDelco Disc Brake Rotors deliver high levels of replacement brake performance.All ACDelco Disc Brake Rotors are balanced to ensure optimum performance on initial fitment during the machining process and are engineered to minimize brake shudder, improve thermal efficiency and reduce brake noise.HIGH CARBON, GREY IRON COMPOSITIONLow noise propensity.High resistance to cracking and fade.OPTIMIZED ROTOR DESIGNReduce rotor coning under high temperature.ADVANCED VENTILATIONOptimal cooling behavior without increased mass.Resistance to thermal judder.Low transient and permanent deformation.PRECISE MACHINING TOLERANCESExtremely low brake shudder.Extremely low DTV (Disc Thickness Variation).Very low levels of LRO (Lateral Runout ).Warranty Information: ACDelco Disc Rotor warranty policy is applicable for 12 months or 20,000 km from date of fitment whichever comes first.