A hydraulic mount apparatus comprising: a housing having an upper portion and a lower portion disposed on a center axis and defining a housing chamber ; a partition member disposed in said housing chamber dividing said housing chamber into a pumping chamber and a receiving chamber with said pumping chamber being between said upper portion and said partition member and said receiving chamber being between said lower portion and said partition member ; a decoupler attached to said partition member separating said pumping chamber and said receiving chamber ; and a moving member disposed in said pumping chamber attached to said decoupler ; wherein said moving member is a non-elastomeric polymer sheet secured to said decoupler for providing the additional damping force, wherein said hydraulic mount apparatus further includes a cap disposed in said pumping chamber spaced from said decoupler to secure said moving member between said cap and said decoupler , wherein said cap includes a lower plate disposed axially spaced from said moving member and a protrusion extending annularly outwardly from said lower plate toward said decoupler to engage said moving member and secure said moving member to said decoupler , characterized in that said cap includes a rib extending annularly outwardly from said lower plate and parallel to said center axis in a direction opposite of said protrusion with said rib having an inner surface facing said center axis and an outer surface opposite of said inner surface defining a pocket disposed in fluid communication with said pumping chamber between said inner surface and said lower plate , wherein said moving member is a die-cut polymer sheet having an outer periphery extending about said center axis. a housing having an upper portion and a lower portion disposed on a center axis and defining a housing chamber ; a partition member disposed in said housing chamber dividing said housing chamber into a pumping chamber and a receiving chamber with said pumping chamber being between said upper portion and said partition member and said receiving chamber being between said lower portion and said partition member ; a decoupler attached to said partition member separating said pumping chamber and said receiving chamber ; and a moving member disposed in said pumping chamber attached to said decoupler ; wherein said moving member is a non-elastomeric polymer sheet secured to said decoupler for providing the additional damping force, wherein said hydraulic mount apparatus further includes a cap disposed in said pumping chamber spaced from said decoupler to secure said moving member between said cap and said decoupler , wherein said cap includes a lower plate disposed axially spaced from said moving member and a protrusion extending annularly outwardly from said lower plate toward said decoupler to engage said moving member and secure said moving member to said decoupler , characterized in that said cap includes a rib extending annularly outwardly from said lower plate and parallel to said center axis in a direction opposite of said protrusion with said rib having an inner surface facing said center axis and an outer surface opposite of said inner surface defining a pocket disposed in fluid communication with said pumping chamber between said inner surface and said lower plate , wherein said moving member is a die-cut polymer sheet having an outer periphery extending about said center axis. <EOS>