An apparatus or method for testing a brake rotor that is mounted on a hub for rotation with respect to a caliper housing. The apparatus includes a bracket having a first end and a second end. A first attachment member and a second attachment member are connected to the bracket and configured to engage the caliper housing. A first sensor is connected to the first end of the bracket for engagement with a first side of the brake rotor. A second sensor is connected to the second end of the bracket for engagement with a second side of the brake rotor.