the shroud interior and ducts 162 a filter 118 or pre filter may be placed within the shroud 120 fig1 show a cross section of the brake dust collection shroud on a drum brake mounted within a tire rim 117 brake drum systems are commonly used in the rear axles 91 of trucks these trucks can have multiple axles 91 with each axle having a drum on each tire in this figure the axle 91 mounted on a drum 113 with the brake pad s 115 exerting braking forces on the interior of the brake drum 113 air is moved or drawn through the drum 113 around the brake pad s or shoe s 115 and brake shoes or pads where the air moves brake dust through the shroud 120 and into the duct 162 for collection fig1 illustrates a control scheme which can be used in the operation of the invention in one aspect of this control scheme when the braking action of the disc brake assembly 110 is initiated electrical power flowing to the vehicle 39 s brake lights 167 also provides power to blowers or fans 95 as shown and described in fig8 also as indicated in fig1 a water sensor 168 can be used to automatically shut off power to the blower or fan 95 when moisture is detected within the housing 128 and or 120 and to indicate same to the motor vehicle operator.