Abstract: When a disc brake is mounted on an axle, particularly an air disc brake on the axle of a commercial vehicle, there is a possibility that an incompatible wheel may be installed. When such a wheel then rotates, interference between wheel and disc brake components may occur, such as a wheel valve stem striking the brake caliper. Equipment damage and tire deflation may result. In order to preclude such brake-wheel interference, a disc brake shield device is interposed between the disc brake and the wheel. When an incompatible wheel is installed over the shield device, the valve stem is deflected away from the brake components. The shield device may further be provided with vanes to circulate cooling air, and may include recesses to minimize valve stem deflection and cut-away portions to enhance brake inspection and maintenance, as long as contact with brake components continues to be precluded.