Abstract: A brake rotor clamping apparatus for use with a brake rotor balancing and milling apparatus, which is adjustable to a range of brake rotors having varied diameters and thickness. The brake rotor clamping apparatus includes a lower clamp pad mounting flange secured to a driven spindle. An adjustable set of clamp pads fitted with replaceable spacer elements are secured to the lower clamp pad mounting flange. Axially opposing the lower clamp pad mounting flange is an upper clamp pad mounting flange. A matching plurality of adjustable clamp pads fitted with spacer elements are secured to the upper clamp pad mounting flange, opposing the clamp pads on the lower clamp pad mounting flange, such that a brake rotor seated on a spring mounted centering cone is clamped between the opposing pairs of clamp pad segments.