The Bendix+ DRM (Dryer Reservoir Module) includes the Bendix+ AD-IS+ air dryer and reservoir system, or the Bendix+ AD-IS+ PuraGuard+ oil coalescing air dryer and reservoir system. The DRM collects and removes air system contaminants in solid, liquid, and aerosol form before they enter the brake system and to provide heavy vehicles with an integrated vehicle air dryer, purge reservoir, governor, and a number of charging valves. These components have been designed as an integrated air supply system. Both air dryer and reservoir systems provide clean, dry air to the components of the brake system which increases the life of the system and reduces maintenance costs. The necessity for daily manual draining of the reservoirs is eliminated.