Abstract: The present invention is predicated upon a disc brake rotor, being made up of a rotor hat, a pair of spaced apart plates, and one or more vane members located between the first and second plates, the one or more vane members including an exterior wall portion inwardly retracted from an outer circumference by an exterior radial spacing and an interior wall portion outwardly retracted from the inner circumference by an interior radial spacing, wherein at least one of the exterior radial spacing and the interior radial spacing is a distance having a depth greater than about 5 mm for the purpose of reducing brake noise in a brake-on position.

Abstract: The present invention is predicated upon a disc brake rotor, being made up of a rotor hat and at least one disc having a thickness including a peripheral wall having at least one groove configuration defined therein that extends over a predetermined arc segment of the peripheral wall for the purpose of changing the natural frequency of the rotor.