For GMC Savana 2500 2008-2011. For GMC Savana 3500 2008-2011. For GMC Savana 4500 2009-2011. 1 Hydraulic Power Brake Booster(Showing as the picture). Type：Hydraulic Power Brake Booster. Independent operation: The hydraulic brake booster can operate independently, without relying on the engine vacuum.
