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 (30, 32, 34); a partition member disposed in said housing chamber (30, 32, 34) dividing said housing chamber (30, 32, 34) into a pumping chamber and a receiving chamber (32, 34) with said pumping chamber being between said upper portion and said partition member and said receiving chamber (32, 34) being between said lower portion and said partition member; a decoupler attached to said partition member separating said pumping chamber and said receiving chamber (32, 34); 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 (30, 32, 34); a partition member disposed in said housing chamber (30, 32, 34) dividing said housing chamber (30, 32, 34) into a pumping chamber and a receiving chamber (32, 34) with said pumping chamber being between said upper portion and said partition member and said receiving chamber (32, 34) being between said lower portion and said partition member; a decoupler attached to said partition member separating said pumping chamber and said receiving chamber (32, 34); 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.