A suspension system including four dampers, a first hydraulic circuit with a front hydraulic line, a rear hydraulic line, and a first longitudinal hydraulic line that extends between and fluidly connects the front and rear hydraulic lines of the first hydraulic circuit, and a second hydraulic circuit with a front hydraulic line, a rear hydraulic line, and a second longitudinal hydraulic line that extends between and fluidly connects the front and rear hydraulic lines of the second hydraulic circuit. One or more frequency dependent valves are connected to and control fluid flow between the first and second hydraulic circuits. The frequency dependent valves are configured to open and hydraulicly decouple the dampers by permitting fluid flow between the first and second hydraulic circuits in response to high frequency suspension impacts.