Check the listing for details. Brake Booster Hydraulic Power Unit Fit Ram HD 2500-5500 2011-18 52013874AE. Condition: New. Listed at 209.99 USD. Type:Hydraulic Power Brake Booster. Independent operation: The hydraulic brake booster can operate independently, without relying on the engine vacuum. 1x Hydraulic Power Brake Booster Without Master Cylinder.